(Tiểu luận) essay subject statistics for business and economics topic research on sunscreen assumption

   UEH UNIVERSITY SCHOOL OF BUSINESS FACULTY OF MATHEMACTICS AND STATISTICS   ESSAY Subject: STATISTICS FOR BUSINESS AND ECONOMICS Topic: RESEARCH ON SUNSCREEN ASSUMPTION   Lecturer: Ms Tran Ha Quyen   Class Code: 21C1STA50802908 Class: DHK47 - FNC03 Group:   Academic year: 2021-2025 h   Group Member:  Nguyen Le Tu Quyen Dinh Su Phuong Anh Pham Ngoc Thuy Duong Do Le Nha Quynh Huynh Ngoc Phuong Hien Member Percentage of completion  Nguyen Le Tu Quyen 100% Dinh Su Phuong Anh 100% Pham Ngoc Thuy Duong 100% Do Le Nha Quynh 100% Huynh Ngoc Phuong Hien 100% h   FOREWORD Humans love beauty, so from the past so far the need for beauty has always existed and growing  Not only in women but in men, all have a basic awareness of beauty problems for themselves With the development of the global economy, there is an increase in the living standards of the  people and this creates a new start for the cosmetic market, growing skincare, ensuring increasing demand High on everyone's self-care Therefore, in the cosmetic market, skincare is like a large piece of cake that businesses, large or small companies want to share But not the  product can also survive long and become preferred, trust in consumers The problem of how to develop a national product has become more difficult than ever Therefore, the research project on sunscreen is posed to learn about how businesses are and will develop their products in a highly competitive market Get sunscreen products such as representing most beauty products, and the problem is also representing the common development issue that businesses still have a lot of concerns And the results of this study are just one of the potential exploitation directions in business that are not all because the development of the economy is infinite and extremely versatile that we have to learn every day In the limit of economic and business statistics, we have implemented research topics "Research on sunscreen consumption” Thereby, in order to learn about the importance and needs of  sunscreen users at different ages Because this is the first project and also for the first time we have cooperated with each other so the project we studied inevitably has many shortcomings, looking forward to her ignoring this error Thereby we also thank Ms Tran Ha Quyen for guiding and instructing questions for us to this topic in the best way h 37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.33.44.55.54.78.655.43.22.2.4.55.2237.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.66   TABLE OF CONTENTS CHAPTER TOPIC INTRODUCTION 1.1 Research context 1.2 Research problem statement .4 1.2.1 Research question 1.2.2 Research problem 1.3 Purpose of Research topics 1.4 Scope and Objectives of Research topics 1.4.1 Scope of Research 1.4.2 Objectives of Research topics THEORETICAL BASIS, PREVIOUS RESEARCH RESULTS AND RESEARCH MODEL 2.1 Interpretation .6 2.1.1 Sunscreen usage 2.1.2 The importance of sunscreen usage 2.2 Theoretical Basis 2.2.1 Descriptive Statistics 2.2.2 Sampling .6 2.2.3 Quantitative Research 2.2.4 Frequency Distributions .7 2.2.5 Mean, Median and Mode 2.2.6 Measure of dispersion 2.2.7 Statistical Inference 2.3 Previous research results .8 2.4 Research model 2.4.1 Suggested 2.4.2 Hypothesis CHAPTER .10 RESEARCH METHODS 10 3.1 Data target 10 3.2 Data approach 11 3.3 Analytical plan 12 3.3.1 Analysis methods .12 h 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37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.33.44.55.54.78.655.43.22.2.4.55.2237.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.66   3.3.2 Statistical tool .12 3.4 Reliability and validity 13 4.1 Descriptive statistics 13 4.1.1 Age .13 4.1.2 Gender 16 4.1.3 Regarding to under the age of 18 .16 4.1.4 Regarding to the 18-25 age group 22 4.1.5 Regarding to the age of 25 and over 28 4.2 Statistical inference 34 4.2.1 Regarding one population 34 4.2.2 Regarding to two population 38 4.3 Index 41 4.4 Forecasting 42 4.4.1 Forecasting by expert 42 4.4.2 Forecasting by survey result 42 CHAPTER .44 PROPOSALS AND CONCLUSION 44 5.1 Conclusion 44 5.1.1 Importance of sunscreen for customers 44 5.1.2 Demand of customers 44 5.2 Suggestions .45 REFERENCES 46 h 37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.99 37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.33.44.55.54.78.655.43.22.2.4.55.2237.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.66   CHAPTER  TOPIC INTRODUCTION 1.1 Research context With enhanced living standards, more and more people use cosmetic products to take care of the skin as an essential need Health and beauty awareness increases According to the survey made  by Q & Me, more than 86% of people surveyed from 16 years and older often use skincare  products About 40% of women over 23 years old skincare daily Besides using skincare  products to improve their skin condition, people also pay great attention to protecting skin from  bad impacts One of the harmful agents to the skin is sunshine, it contains a lot of ultraviolet rays like UVA, UVB These ultraviolet rays through the clouds and air, clothes, glass doors causing a negative impact on the skin is the cause of skin damage, causing the skin to be darkened, appearing many wrinkles, melasma and freckles Especially when the appearance of ultraviolet rays is almost always, even without sunshine: in winter as well as summer, on cloudy days as well as sunny days So the use of sunscreen is extremely necessary to protect your own skin Recognizing that importance, the current sunscreen market is also growing strongly, reforming continuously in accordance with customer needs So businesses are increasingly facing many difficulties in successful development in this market when competitiveness is too high, each  product is released to respond to consumer needs This has become a concern, how the company's products reach a place in the sunscreen industry? Currently, some sunscreen has created a large echo in the early stages with eye-catching and eye-catching product packaging, etc However, it cannot be maintained for long-term attraction, rampage sales revenue Therefore, businesses want to develop well in such a competitive market, learning about  potential buying objects that businesses want to focus on is extremely important Identify the specific customer objects that the company wants to target, thereby developing products according to the needs and purpose of the target group Because each person's use in each age is different, especially for cosmetics, specifically determining the development direction for the company's products is very important Since then, the “research topic on sunscreen consumption” is built to find customer needs Considered as a small-scale study, found the purpose of use to identify the development direction of the product aimed at specific potential customers Therefore, it is possible to focus on h 37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.99 37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.33.44.55.54.78.655.43.22.2.4.55.2237.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.66   developing in the right direction, constantly improving their products, increasing competitiveness in the sunscreen market 1.2 Research problem statement 1.2.1 Research question    How often people use sunscreen?    When people often use sunscreen?    Frequency of using sunscreen/week of everyone?    Do people often use sunscreen brands?    Sunscreen that people often use?    Why people use current sunscreen?    People's satisfaction when using sunscreen?    How much are people ready to pay for sunscreen? 1.2.2 Research problem The research problem here is the importance of sunscreen and user needs in each age group 1.3 Purpose of Research topics The main purpose our group is heading to, after analyzing the statistical data of this research, giving producers information and recommend to them dominant products which are commonly utilized sorted by groups of aims, age, price, etc We also want to provide people with different insights about the advantages of understanding their skincare products, and how to make the most of using appropriate sunscreens for consumers’ skin 1.4 Scope and Objectives of Research topics 1.4.1 Scope of Research Products under study:  sunscreens Duration of the Research topics:  1 week   1.4.2 Objectives of Research topics Objectives:  People from various age who care about their skincare routine and want to join the research topics h 37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.99 37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.33.44.55.54.78.655.43.22.2.4.55.2237.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.66   CHAPTER THEORETICAL BASIS, PREVIOUS RESEARCH RESULTS AND RESEARCH MODEL Chapter presents some important concepts, theoretical framework and research papers to build a model of factor affecting the use of sunscreen 2.1 Interpretation 2.1.1 Sunscreen usage In our modern society, sunscreen usage is no longer a strange thing The value of sunscreen may  be summed in just a few words at the most basic level: it protects your skin from the sun The sun emits natural energy in the form of ultraviolet (UV) radiation, which can cause skin damage In addition, sunscreen protects your skin by acting as a cover for your skin cells 2.1.2 The importance of sunscreen usage What happens if you don’t put on sunscreen? The answer is simple: you'll expose your skin to unpleasant sunburns, premature wrinkles, dark patches, and skin cancer Skin cancer is on the rise as a result of sun damage According to the Skin Cancer Foundation,  by the age of 70, one out of every five Americans will have skin cancer If you don't use sunscreen and get sunburned frequently, you're putting yourself at risk for melanoma, a dangerous kind of skin cancer   2.2 Theoretical Basis 2.2.1 Descriptive Statistics Descriptive statistics summarize and organize characteristics (age, gender, of the users of  sunscreen) of a data set A data set is a collection of responses or observations from a sample or  entire population 2.2.2 Sampling  We seldom conduct population surveys while conducting research since they are exceedingly costly and time-consuming Instead, we applied a sampling process Sampling   is the process of  selecting a group of subjects from the larger population that is being studied We made a sample from our university h 37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.99 37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.33.44.55.54.78.655.43.22.2.4.55.2237.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.66   2.2.3 Quantitative Research Regarding scientific research, quantitative research plays an important role in the topic Quantitative research, Williams, states that “Quantitative research involves the collection of data so that information can be quantified and subjected to statistical treatment in order to support or  refute alternative knowledge claims” Furthermore, Williams remarked that quantitative research starts with a statement of a problem, generating of hypothesis or research questions, reviewing related literature, and a quantitative analysis of data Therefore, it refers to the process of  gathering numerical data in order to understand the use of sunscreen 2.2.4 Frequency Distributions Tables that present data based on the frequency of how many data values fit into specific intervals or categories are known as  frequency distributions A frequency distribution lists the data values such as the frequency and the amount of time using sunscreen of participants along with their corresponding frequencies They are referred to as distributions because they show how the observations are spread across the various categories 2.2.5 Mean, Median and Mode When given a set of raw data, one of the most useful ways of summarizing that data is to find an average of that set of data An average is a measure of the center of the data set There are three common ways of describing the center of a set of numbers They are the mean, the median and the mode and are calculated as follows The mean − add up all the numbers and divide by how many numbers there are The average helps us to study the variation of the phenomenon over time, the basic development trend of the large phenomenon Mean is equally important in the application of statistical analysis methods, especially computing the average willingness to pay for sunscreen Analyzing variation in statistics, predicting relationships and sampling about the use of sunscreen mostly use the mean The median − is the middle number It is found by putting the numbers in order and taking the actual middle number if there is one, or the average of the two middle numbers if not The mode − is the most commonly occurring number 2.2.6 Measure of dispersion Measures of dispersion describe the spread of the data They include the range, interquartile range, standard deviation and variance h 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37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.33.44.55.54.78.655.43.22.2.4.55.2237.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.66   Range is the difference between the largest and the smallest value in a distribution This is the simplest measure of variability For this research it is very useful, because we would want to know in a sample the ages of youngest and oldest participants Standard deviation is the most important and commonly used measure of dispersion It is the  positive square root of the mean of the squared deviations of observations from their mean Variance refers to a statistical measurement of the spread between numbers in a data set More specifically, variance measures how far each number in the set is from the mean and thus from every other number in the set Variance is often depicted by this symbol: σ Coefficient of Variation indicates how large the standard deviation is in relation to the mean 2.2.7 Statistical Inference Inferential Statistics makes conclusions about the wider population from which the sample was derived using data from a sample We need confidence that our sample properly reflects the  population since the purpose of inferential statistics is to extract inferences from a sample and generalize them to a population For example, when we are doing some research, we compare using frequency between male and female to make conclusion 2.3 Previous research results The use of sunscreen is increasingly popular and encouraged as natural indicators such as UV rays, environmental pollution and global warming increase and bear negative signs This is the reason why there are a lot of surveys conducted to provide information and evaluate the use of  sunscreen by consumers recently The research of  Effect of Sunscreen Application Under Maximal Use Conditions on Plasma Concentration of Sunscreen Active Ingredients  - Murali K Matta, Robbert Zusterzeel,  Nageswara R Pili (2019) gave the knowledge about how sunscreens effect when using them too much Twenty-four participants were randomized to using sunscreen products and testing their  responses to elements: Octocrylene, Ecamsule, Oxybenzone, Avobenzone   A Review of Sunscreen Safety and Efficacy by Francis P Gasparro, Mark Mitchnick, and J Frank Nash shows the basic information about sunscreen and whether it protects us from UVR Based on the results, they assume that sunscreens block only a portion of the UVR spectrum  Now that true broad-spectrum protection is possible, this should no longer be an issue h 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of people surveyed choose SPF / FA index suitable for their skin SPF stands for sun protection factor so it is easy to understand when it is one of the important criteria when choosing a sunscreen We have to apply sunscreen every day for a long time, so the choice of  sunscreen suitable for skin and hypoallergenic is an essential criterion Therefore, the rate of  “Benign nature ingredients” is 17%, and “For sensitive skin” is 9% Besides the above criteria, the price is also an important criterion to influence the selection of  sunscreen There are 26% of people with the age of over 25 participating in the survey choose “Suitable price” People tend to choose sunscreen not only following their requirements but also suitable for their financial ability According to the survey, none of them choose “Good oil alkalescence” (0%), “Good moisturizing ability” (0%), “For dry skin” (0%), “Purposeless” (0%) Those who are over 25 years old, especially women, are very focused on their skin Sunscreen is an essential object to  protect their skin So most of them buy sunscreen for clear purposes 32 h 37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.99 37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.33.44.55.54.78.655.43.22.2.4.55.2237.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.66   Table 17: Frequency of the purpose of using sunscreen (over 25 years old) The purpose of using Frequency sunscreen Relative Percent frequency frequency SPF / FA index suitable 0,22 22% Suitable price 0,26 26% Good oil alkalescence 0 0% Good moisturizing ability 0 0% Good waterproof ability 0,26 26% For sensitive skin 0,09 9% For dry skin 0 0% Benign nature ingredients 0,17 17% Purposeless 0 0% Total 23 100% 4.1.5.5 Willingness to pay Graph 18: Willingness to pay (over 25 years old) 33 h 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37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.33.44.55.54.78.655.43.22.2.4.55.2237.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.66   According to the graph, percentage of people who are willing to pay from 200.000 VND to 500.000 VND (50%) and over 500.000 VND (42%) are much larger than the percentage of   people who are willing to pay under 200.000 VND (8%) Most people over 25 have worked and have their income, they can spend a lot of money to buy sunscreen Table 18: Willingness to pay (over 25 years old) Willingness to pay Frequency Relative frequency Percent frequency Under 200.000 0,08 8% From 200.000 - 500.000 0,5 50% Over 500.000 0,42 42% 12 100% Total   4.2 Statistical inference 4.2.1 Regarding one population We choose the variable from the level of using sunscreen among both genders with a sample of  50 participants (assuming that the variable has a standard distribution unaffected by the data) in order to test population mean and proportion with 95% confidence Table 19: Showing the sample frequency for the level of participants using sunscreen Level of using sunscreen Frequency 34 h 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Step 3: 35 h 37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.99 37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.33.44.55.54.78.655.43.22.2.4.55.2237.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.66     Step 4: Based on the table of t-distribution, 0.025 <  p-value 0.51 Step 2: α =0.05 Step 3: Step 4: Based on the table of accumulated probability of   standard distribution Step 5: Since p < α ,we reject H0 Now, it is clear that not only the sunscreen industry should not lower their production but they also have to promote their work for more effective sunscreen 36 h 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37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.33.44.55.54.78.655.43.22.2.4.55.2237.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.66   to meet the demand of customers since 67% people and even more show interest in protecting their skin from the sun 4.2.1.4 Test of population mean for male We choose the variable from satisfaction level of male with a sample of 31 participants (assuming that the variable has a standard distribution unaffected by the data) in order to test  population mean 95% confidence Table 20: Frequency of each level of satisfaction of male Satisfaction level of male Frequency 10 4 5 Total 31 Table showing the sample frequency for the satisfaction level of male According to the table we have Sample size n = 31 Sample mean = =2.81 Sample variance = 0.33935 Standard deviation s = = 0,58 37 h 37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.99 37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.33.44.55.54.78.655.43.22.2.4.55.2237.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.66   We assume a hypothesis H0: 2.7 with : Average point assessment of men's satisfaction in using sunscreen Hence, we can conclude that the majority of men feel satisfied with the sunscreen he is using, businesses not need to improve and develop this market Step 1: H0:   Step 2.7 Hα : < 2.7 α = 0.05 Step t = = 1,06 Step 4: Based on the table of t-distribution, 0.05 <  p-value α  4.3 Index From our survey result, using those data, we can make a table of the number of people who started using sunscreen each year from 2018 to 2021 Table 23: Number of users each year Year Number of people 2018 13 2019 21 2020 29 2021 47 41 h 37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.99 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upward trend is understandable as global warming is occured and becoming even worse time by time leading to skin protection from UVR 4.4 Forecasting 4.4.1 Forecasting by expert Graph 19: Market revenue of the sun protection market worldwide from 2012 to 2025 42 h 37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.99 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   2018 - 2019 : the    2019 - 2020: the value increased 38%    2020 - 2021: the value increased 62%    Average % change = 53.84% value increased 61.5% Following the above results, we can assume that value each year has an extremely expanded trend by average 53.84% As here, we expect the number in 2022 would be 47 x 153.84% ≈ 72 It is easy to understand this value because consumers have become more conscious that their skin deserves all the treatment it can receive, not just in the form of  sunscreens, but also in the kind of products that help the skin cope better with sunshine in general One of the major drivers of the fast-growing sun care business is solar protection 43 h 37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.99 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18-25 years old, falling to under 18 years of age and finally the group over 25 years old - Lites most interested    Gender: Females give their interest to the use of more sunscreen than males Based on our  research, the level of satisfaction of females is likely to be greater than males It could be easily understood that most sunscreen advertising campaigns are aimed at women and directed at sensitive skin Therefore, the texture isn’t suitable for males and they would not gain good experience in using it Combined with the forecast we have analyzed in Chapter 4, it can be concluded that the number  of people interested in and the use of sunscreen will increase much in the future They are willing to invest more for their beauty going along with the increase in quality of life 5.1.2 Demand of customers Demand at each age is different, we can see through the statistics described in each group in Chapter 4:    Under 18: Overall this age, most people have interest in their skin but not really high There was a closer understanding of their skin to find suitable products They focus on the use of   benign products that not irritate sensitive skin, functions that are suitable for puberty skin, and a cheaper price 44 h 37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.99 37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.33.44.55.54.78.655.43.22.2.4.55.2237.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.66      From 18 - 25: At this point, people had more attention than the age of 18 and were more satisfied with the products they have chosen, so it can be seen that people have a better  understanding of their needs At this age, people are interested in products that meet many  purposes and both prices, they focus on convenience and multi-purpose calculation    Over 25: People in this age group tend to be interested in anti-aging products It makes sense of the highest level of using sunscreen Besides, sunscreen products can support makeup, anti-pollution to protect facial skin, and good sun protection At this age they are no longer interested in the money that focuses on product quality, most of them know what they need and are satisfied with their choice 5.2 Suggestions Since the conclusions have been drawn above, there will be solutions that can help businesses grow their products in the sunscreen market:    Enterprises need to identify customers that they want to aim for Since then develop  professional products according to the needs of each group of subjects Consumers often tend to choose a product that suits themselves rather than a product that has too much use Although the users choose the product with many functions, however, there is generally outstanding use in accordance with their age    Male customers are increasing the necessity to protect the skin from sunburns will lead to higher sunscreen consumption Besides, they are gradually searching for multifunctional and advanced products For that reason, enterprises should develop formulations, focus on their  demands and requirements that will be successful in today’s market 45 h 37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.99 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