Lecture Communication research: Asking questions, finding answers (4e) Chapter 4: Introduction to quantitative research

Lecture Communication research: Asking questions, finding answers (4e) Chapter 4: Introduction to quantitative research. After reading this chapter, you should be able to: Describe quantitative research and its assumptions, identify examples of quantitative research, explain analytic deduction, explain the fivecomponent model for quantitative research, explain the role of hypotheses in quantitative research,... Đề tài Hoàn thiện công tác quản trị nhân sự tại Công ty TNHH Mộc Khải Tuyên được nghiên cứu nhằm giúp công ty TNHH Mộc Khải Tuyên làm rõ được thực trạng công tác quản trị nhân sự trong công ty như thế nào từ đó đề ra các giải pháp giúp công ty hoàn thiện công tác quản trị nhân sự tốt hơn trong thời gian tới.

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Information, but by the time I had the number it was long after five and no one answered the phone ‘Will you ring again?’ ‘I’ve rung them three times.’ ‘It’s very important.’ ‘Sorry I’m afraid no one’s there.’ I went back to the drawing room and thought for an in- stant that they were chance visitors, all these official people who suddenly filled it But as they drew back the sheet and looked at Gatsby with unmoved eyes, his protest continued in my brain ‘Look here, old sport, you’ve got to get somebody for me You’ve got to try hard I can’t go through this alone.’ Some one started to ask me questions but I broke away and going upstairs looked hastily through the unlocked parts of his desk—he’d never told me definitely that his par- ents were dead But there was nothing—only the picture of Dan Cody, a token of forgotten violence staring down from the wall Next morning I sent the butler to New York with a letter to Wolfshiem which asked for information and urged him to come out on the next train That request seemed super- fluous when I wrote it I was sure he’d start when he saw the newspapers, just as I was sure there’d be a wire from Daisy before noon—but neither a wire nor Mr Wolfshiem arrived, no one arrived except more police and photographers and newspaper men When the butler brought back Wolfshiem’s answer I began to have a feeling of defiance, of scornful

soli-darity between Gatsby and me against them all.

Copyright © 2015 McGraw-Hill Education All rights reserved No reproduction or distribution without the prior written consent of

McGraw-Hill Education.

INTRODUCTION TO QUANTITATIVE RESEARCH

Trang 2

Information, but by the time I had the number it was long after five and no one answered the phone ‘Will you ring again?’ ‘I’ve rung them three times.’ ‘It’s very important.’ ‘Sorry I’m afraid no one’s there.’ I went back to the drawing room and thought for an in- stant that they were chance visitors, all these official people who suddenly filled it But as they drew back the sheet and looked at Gatsby with unmoved eyes, his protest continued in my brain ‘Look here, old sport, you’ve got to get somebody for me You’ve got to try hard I can’t go through this alone.’ Some one started to ask me questions but I broke away and going upstairs looked hastily through the unlocked parts of his desk—he’d never told me definitely that his par- ents were dead But there was nothing—only the picture of Dan Cody, a token of forgotten violence staring down from the wall Next morning I sent the butler to New York with a letter to Wolfshiem which asked for information and urged him to come out on the next train That request seemed super- fluous when I wrote it I was sure he’d start when he saw the newspapers, just as I was sure there’d be a wire from Daisy before noon—but neither a wire nor Mr Wolfshiem arrived, no one arrived except more police and photographers and newspaper men When the butler brought back Wolfshiem’s answer I began to have a feeling of defiance, of scornful

soli-darity between Gatsby and me against them all.

Copyright © 2015 McGraw-Hill Education All rights reserved No reproduction or distribution without the prior written consent of

McGraw-Hill Education.

WHAT IS QUANTITATIVE RESEARCH

Quantity is the unit of analysisAmountsFrequenciesDegreesValuesIntensity

Uses statistics for greater precision and objectivity

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Information, but by the time I had the number it was long after five and no one answered the phone ‘Will you ring again?’ ‘I’ve rung them three times.’ ‘It’s very important.’ ‘Sorry I’m afraid no one’s there.’ I went back to the drawing room and thought for an in- stant that they were chance visitors, all these official people who suddenly filled it But as they drew back the sheet and looked at Gatsby with unmoved eyes, his protest continued in my brain ‘Look here, old sport, you’ve got to get somebody for me You’ve got to try hard I can’t go through this alone.’ Some one started to ask me questions but I broke away and going upstairs looked hastily through the unlocked parts of his desk—he’d never told me definitely that his par- ents were dead But there was nothing—only the picture of Dan Cody, a token of forgotten violence staring down from the wall Next morning I sent the butler to New York with a letter to Wolfshiem which asked for information and urged him to come out on the next train That request seemed super- fluous when I wrote it I was sure he’d start when he saw the newspapers, just as I was sure there’d be a wire from Daisy before noon—but neither a wire nor Mr Wolfshiem arrived, no one arrived except more police and photographers and newspaper men When the butler brought back Wolfshiem’s answer I began to have a feeling of defiance, of scornful

soli-darity between Gatsby and me against them all.

Copyright © 2015 McGraw-Hill Education All rights reserved No reproduction or distribution without the prior written consent of

McGraw-Hill Education.

Trang 4

Information, but by the time I had the number it was long after five and no one answered the phone ‘Will you ring again?’ ‘I’ve rung them three times.’ ‘It’s very important.’ ‘Sorry I’m afraid no one’s there.’ I went back to the drawing room and thought for an in- stant that they were chance visitors, all these official people who suddenly filled it But as they drew back the sheet and looked at Gatsby with unmoved eyes, his protest continued in my brain ‘Look here, old sport, you’ve got to get somebody for me You’ve got to try hard I can’t go through this alone.’ Some one started to ask me questions but I broke away and going upstairs looked hastily through the unlocked parts of his desk—he’d never told me definitely that his par- ents were dead But there was nothing—only the picture of Dan Cody, a token of forgotten violence staring down from the wall Next morning I sent the butler to New York with a letter to Wolfshiem which asked for information and urged him to come out on the next train That request seemed super- fluous when I wrote it I was sure he’d start when he saw the newspapers, just as I was sure there’d be a wire from Daisy before noon—but neither a wire nor Mr Wolfshiem arrived, no one arrived except more police and photographers and newspaper men When the butler brought back Wolfshiem’s answer I began to have a feeling of defiance, of scornful

soli-darity between Gatsby and me against them all.

Copyright © 2015 McGraw-Hill Education All rights reserved No reproduction or distribution without the prior written consent of McGraw-Hill Education.FOUNDATION FOR QUANTITATIVE RESEARCHConcept Abstract thinking to distinguish it from other elementsConstruct

Trang 5

Information, but by the time I had the number it was long after five and no one answered the phone ‘Will you ring again?’ ‘I’ve rung them three times.’ ‘It’s very important.’ ‘Sorry I’m afraid no one’s there.’ I went back to the drawing room and thought for an in- stant that they were chance visitors, all these official people who suddenly filled it But as they drew back the sheet and looked at Gatsby with unmoved eyes, his protest continued in my brain ‘Look here, old sport, you’ve got to get somebody for me You’ve got to try hard I can’t go through this alone.’ Some one started to ask me questions but I broke away and going upstairs looked hastily through the unlocked parts of his desk—he’d never told me definitely that his par- ents were dead But there was nothing—only the picture of Dan Cody, a token of forgotten violence staring down from the wall Next morning I sent the butler to New York with a letter to Wolfshiem which asked for information and urged him to come out on the next train That request seemed super- fluous when I wrote it I was sure he’d start when he saw the newspapers, just as I was sure there’d be a wire from Daisy before noon—but neither a wire nor Mr Wolfshiem arrived, no one arrived except more police and photographers and newspaper men When the butler brought back Wolfshiem’s answer I began to have a feeling of defiance, of scornful

soli-darity between Gatsby and me against them all.

Copyright © 2015 McGraw-Hill Education All rights reserved No reproduction or distribution without the prior written consent of

McGraw-Hill Education.

HYPOTHESES FOR QUANTITATIVE RESEARCH

Educated guess or presumption based on literature

States the nature of the relationship between two or more variables

Predicts the research outcome

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Information, but by the time I had the number it was long after five and no one answered the phone ‘Will you ring again?’ ‘I’ve rung them three times.’ ‘It’s very important.’ ‘Sorry I’m afraid no one’s there.’ I went back to the drawing room and thought for an in- stant that they were chance visitors, all these official people who suddenly filled it But as they drew back the sheet and looked at Gatsby with unmoved eyes, his protest continued in my brain ‘Look here, old sport, you’ve got to get somebody for me You’ve got to try hard I can’t go through this alone.’ Some one started to ask me questions but I broke away and going upstairs looked hastily through the unlocked parts of his desk—he’d never told me definitely that his par- ents were dead But there was nothing—only the picture of Dan Cody, a token of forgotten violence staring down from the wall Next morning I sent the butler to New York with a letter to Wolfshiem which asked for information and urged him to come out on the next train That request seemed super- fluous when I wrote it I was sure he’d start when he saw the newspapers, just as I was sure there’d be a wire from Daisy before noon—but neither a wire nor Mr Wolfshiem arrived, no one arrived except more police and photographers and newspaper men When the butler brought back Wolfshiem’s answer I began to have a feeling of defiance, of scornful

soli-darity between Gatsby and me against them all.

Copyright © 2015 McGraw-Hill Education All rights reserved No reproduction or distribution without the prior written consent of

McGraw-Hill Education.

TYPES OF RESEARCH HYPOTHESES

Directional hypothesis

Precise statement indicating the nature and

direction of the relationship/difference between variables

Nondirectional hypothesis

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Information, but by the time I had the number it was long after five and no one answered the phone ‘Will you ring again?’ ‘I’ve rung them three times.’ ‘It’s very important.’ ‘Sorry I’m afraid no one’s there.’ I went back to the drawing room and thought for an in- stant that they were chance visitors, all these official people who suddenly filled it But as they drew back the sheet and looked at Gatsby with unmoved eyes, his protest continued in my brain ‘Look here, old sport, you’ve got to get somebody for me You’ve got to try hard I can’t go through this alone.’ Some one started to ask me questions but I broke away and going upstairs looked hastily through the unlocked parts of his desk—he’d never told me definitely that his par- ents were dead But there was nothing—only the picture of Dan Cody, a token of forgotten violence staring down from the wall Next morning I sent the butler to New York with a letter to Wolfshiem which asked for information and urged him to come out on the next train That request seemed super- fluous when I wrote it I was sure he’d start when he saw the newspapers, just as I was sure there’d be a wire from Daisy before noon—but neither a wire nor Mr Wolfshiem arrived, no one arrived except more police and photographers and newspaper men When the butler brought back Wolfshiem’s answer I began to have a feeling of defiance, of scornful

soli-darity between Gatsby and me against them all.

Copyright © 2015 McGraw-Hill Education All rights reserved No reproduction or distribution without the prior written consent of

McGraw-Hill Education.

ASSESSING HYPOTHESES

Simply stated?

Single sentence?

At least two variables?

Variables clearly stated?

Is the relationship/difference precisely stated?

Trang 8

Information, but by the time I had the number it was long after five and no one answered the phone ‘Will you ring again?’ ‘I’ve rung them three times.’ ‘It’s very important.’ ‘Sorry I’m afraid no one’s there.’ I went back to the drawing room and thought for an in- stant that they were chance visitors, all these official people who suddenly filled it But as they drew back the sheet and looked at Gatsby with unmoved eyes, his protest continued in my brain ‘Look here, old sport, you’ve got to get somebody for me You’ve got to try hard I can’t go through this alone.’ Some one started to ask me questions but I broke away and going upstairs looked hastily through the unlocked parts of his desk—he’d never told me definitely that his par- ents were dead But there was nothing—only the picture of Dan Cody, a token of forgotten violence staring down from the wall Next morning I sent the butler to New York with a letter to Wolfshiem which asked for information and urged him to come out on the next train That request seemed super- fluous when I wrote it I was sure he’d start when he saw the newspapers, just as I was sure there’d be a wire from Daisy before noon—but neither a wire nor Mr Wolfshiem arrived, no one arrived except more police and photographers and newspaper men When the butler brought back Wolfshiem’s answer I began to have a feeling of defiance, of scornful

soli-darity between Gatsby and me against them all.

Copyright © 2015 McGraw-Hill Education All rights reserved No reproduction or distribution without the prior written consent of McGraw-Hill Education.NULL HYPOTHESESImplicit complementary statement to the research hypothesisStates no relationship/difference exists between variables

Statistical test performed on the null

Trang 9

Information, but by the time I had the number it was long after five and no one answered the phone ‘Will you ring again?’ ‘I’ve rung them three times.’ ‘It’s very important.’ ‘Sorry I’m afraid no one’s there.’ I went back to the drawing room and thought for an in- stant that they were chance visitors, all these official people who suddenly filled it But as they drew back the sheet and looked at Gatsby with unmoved eyes, his protest continued in my brain ‘Look here, old sport, you’ve got to get somebody for me You’ve got to try hard I can’t go through this alone.’ Some one started to ask me questions but I broke away and going upstairs looked hastily through the unlocked parts of his desk—he’d never told me definitely that his par- ents were dead But there was nothing—only the picture of Dan Cody, a token of forgotten violence staring down from the wall Next morning I sent the butler to New York with a letter to Wolfshiem which asked for information and urged him to come out on the next train That request seemed super- fluous when I wrote it I was sure he’d start when he saw the newspapers, just as I was sure there’d be a wire from Daisy before noon—but neither a wire nor Mr Wolfshiem arrived, no one arrived except more police and photographers and newspaper men When the butler brought back Wolfshiem’s answer I began to have a feeling of defiance, of scornful

soli-darity between Gatsby and me against them all.

Copyright © 2015 McGraw-Hill Education All rights reserved No reproduction or distribution without the prior written consent of

McGraw-Hill Education.

REMEMBER THAT

Hypotheses are always tentative

Research hypothesis, not the null hypothesis, is the focus of the research and presented in the

Trang 10

Information, but by the time I had the number it was long after five and no one answered the phone ‘Will you ring again?’ ‘I’ve rung them three times.’ ‘It’s very important.’ ‘Sorry I’m afraid no one’s there.’ I went back to the drawing room and thought for an in- stant that they were chance visitors, all these official people who suddenly filled it But as they drew back the sheet and looked at Gatsby with unmoved eyes, his protest continued in my brain ‘Look here, old sport, you’ve got to get somebody for me You’ve got to try hard I can’t go through this alone.’ Some one started to ask me questions but I broke away and going upstairs looked hastily through the unlocked parts of his desk—he’d never told me definitely that his par- ents were dead But there was nothing—only the picture of Dan Cody, a token of forgotten violence staring down from the wall Next morning I sent the butler to New York with a letter to Wolfshiem which asked for information and urged him to come out on the next train That request seemed super- fluous when I wrote it I was sure he’d start when he saw the newspapers, just as I was sure there’d be a wire from Daisy before noon—but neither a wire nor Mr Wolfshiem arrived, no one arrived except more police and photographers and newspaper men When the butler brought back Wolfshiem’s answer I began to have a feeling of defiance, of scornful

soli-darity between Gatsby and me against them all.

Copyright © 2015 McGraw-Hill Education All rights reserved No reproduction or distribution without the prior written consent of

McGraw-Hill Education.

RESEARCH QUESTIONS

FOR QUANTITATIVE RESEARCH

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Information, but by the time I had the number it was long after five and no one answered the phone ‘Will you ring again?’ ‘I’ve rung them three times.’ ‘It’s very important.’ ‘Sorry I’m afraid no one’s there.’ I went back to the drawing room and thought for an in- stant that they were chance visitors, all these official people who suddenly filled it But as they drew back the sheet and looked at Gatsby with unmoved eyes, his protest continued in my brain ‘Look here, old sport, you’ve got to get somebody for me You’ve got to try hard I can’t go through this alone.’ Some one started to ask me questions but I broke away and going upstairs looked hastily through the unlocked parts of his desk—he’d never told me definitely that his par- ents were dead But there was nothing—only the picture of Dan Cody, a token of forgotten violence staring down from the wall Next morning I sent the butler to New York with a letter to Wolfshiem which asked for information and urged him to come out on the next train That request seemed super- fluous when I wrote it I was sure he’d start when he saw the newspapers, just as I was sure there’d be a wire from Daisy before noon—but neither a wire nor Mr Wolfshiem arrived, no one arrived except more police and photographers and newspaper men When the butler brought back Wolfshiem’s answer I began to have a feeling of defiance, of scornful

soli-darity between Gatsby and me against them all.

Copyright © 2015 McGraw-Hill Education All rights reserved No reproduction or distribution without the prior written consent of

McGraw-Hill Education.

A VARIABLE

Is an element that is identified in the hypothesis or research question

Is a property or characteristic of people or things that varies in quality or magnitude

Must have two or more levels

Trang 12

Information, but by the time I had the number it was long after five and no one answered the phone ‘Will you ring again?’ ‘I’ve rung them three times.’ ‘It’s very important.’ ‘Sorry I’m afraid no one’s there.’ I went back to the drawing room and thought for an in- stant that they were chance visitors, all these official people who suddenly filled it But as they drew back the sheet and looked at Gatsby with unmoved eyes, his protest continued in my brain ‘Look here, old sport, you’ve got to get somebody for me You’ve got to try hard I can’t go through this alone.’ Some one started to ask me questions but I broke away and going upstairs looked hastily through the unlocked parts of his desk—he’d never told me definitely that his par- ents were dead But there was nothing—only the picture of Dan Cody, a token of forgotten violence staring down from the wall Next morning I sent the butler to New York with a letter to Wolfshiem which asked for information and urged him to come out on the next train That request seemed super- fluous when I wrote it I was sure he’d start when he saw the newspapers, just as I was sure there’d be a wire from Daisy before noon—but neither a wire nor Mr Wolfshiem arrived, no one arrived except more police and photographers and newspaper men When the butler brought back Wolfshiem’s answer I began to have a feeling of defiance, of scornful

soli-darity between Gatsby and me against them all.

Copyright © 2015 McGraw-Hill Education All rights reserved No reproduction or distribution without the prior written consent of

McGraw-Hill Education.

INDEPENDENT VARIABLE

Manipulation or variation of this variable is the cause of change in other variables

Technically, independent variable is the term reserved for experimental studies

Also called antecedent variable, experimental

Trang 13

Information, but by the time I had the number it was long after five and no one answered the phone ‘Will you ring again?’ ‘I’ve rung them three times.’ ‘It’s very important.’ ‘Sorry I’m afraid no one’s there.’ I went back to the drawing room and thought for an in- stant that they were chance visitors, all these official people who suddenly filled it But as they drew back the sheet and looked at Gatsby with unmoved eyes, his protest continued in my brain ‘Look here, old sport, you’ve got to get somebody for me You’ve got to try hard I can’t go through this alone.’ Some one started to ask me questions but I broke away and going upstairs looked hastily through the unlocked parts of his desk—he’d never told me definitely that his par- ents were dead But there was nothing—only the picture of Dan Cody, a token of forgotten violence staring down from the wall Next morning I sent the butler to New York with a letter to Wolfshiem which asked for information and urged him to come out on the next train That request seemed super- fluous when I wrote it I was sure he’d start when he saw the newspapers, just as I was sure there’d be a wire from Daisy before noon—but neither a wire nor Mr Wolfshiem arrived, no one arrived except more police and photographers and newspaper men When the butler brought back Wolfshiem’s answer I began to have a feeling of defiance, of scornful

soli-darity between Gatsby and me against them all.

Copyright © 2015 McGraw-Hill Education All rights reserved No reproduction or distribution without the prior written consent of

McGraw-Hill Education.

DEPENDENT VARIABLE

The variable of primary interest

Research question/hypothesis describes, explains, or predicts changes in it

The variable that is influenced or changed by the independent variable

In non-experimental research, also called criterion

Trang 14

Information, but by the time I had the number it was long after five and no one answered the phone ‘Will you ring again?’ ‘I’ve rung them three times.’ ‘It’s very important.’ ‘Sorry I’m afraid no one’s there.’ I went back to the drawing room and thought for an in- stant that they were chance visitors, all these official people who suddenly filled it But as they drew back the sheet and looked at Gatsby with unmoved eyes, his protest continued in my brain ‘Look here, old sport, you’ve got to get somebody for me You’ve got to try hard I can’t go through this alone.’ Some one started to ask me questions but I broke away and going upstairs looked hastily through the unlocked parts of his desk—he’d never told me definitely that his par- ents were dead But there was nothing—only the picture of Dan Cody, a token of forgotten violence staring down from the wall Next morning I sent the butler to New York with a letter to Wolfshiem which asked for information and urged him to come out on the next train That request seemed super- fluous when I wrote it I was sure he’d start when he saw the newspapers, just as I was sure there’d be a wire from Daisy before noon—but neither a wire nor Mr Wolfshiem arrived, no one arrived except more police and photographers and newspaper men When the butler brought back Wolfshiem’s answer I began to have a feeling of defiance, of scornful

soli-darity between Gatsby and me against them all.

Copyright © 2015 McGraw-Hill Education All rights reserved No reproduction or distribution without the prior written consent of

McGraw-Hill Education.

RELATIONSHIP BETWEEN IVS AND DVS

Cannot specify independent variables without specifying dependent variables

Number of independent and dependent variables

depends on the nature and complexity of the study

Trang 15

Information, but by the time I had the number it was long after five and no one answered the phone ‘Will you ring again?’ ‘I’ve rung them three times.’ ‘It’s very important.’ ‘Sorry I’m afraid no one’s there.’ I went back to the drawing room and thought for an in- stant that they were chance visitors, all these official people who suddenly filled it But as they drew back the sheet and looked at Gatsby with unmoved eyes, his protest continued in my brain ‘Look here, old sport, you’ve got to get somebody for me You’ve got to try hard I can’t go through this alone.’ Some one started to ask me questions but I broke away and going upstairs looked hastily through the unlocked parts of his desk—he’d never told me definitely that his par- ents were dead But there was nothing—only the picture of Dan Cody, a token of forgotten violence staring down from the wall Next morning I sent the butler to New York with a letter to Wolfshiem which asked for information and urged him to come out on the next train That request seemed super- fluous when I wrote it I was sure he’d start when he saw the newspapers, just as I was sure there’d be a wire from Daisy before noon—but neither a wire nor Mr Wolfshiem arrived, no one arrived except more police and photographers and newspaper men When the butler brought back Wolfshiem’s answer I began to have a feeling of defiance, of scornful

soli-darity between Gatsby and me against them all.

Copyright © 2015 McGraw-Hill Education All rights reserved No reproduction or distribution without the prior written consent of

McGraw-Hill Education.

OPERATIONALIZING VARIABLES

All variables need an operationalization

Multiple operationalizations exist for most variables

Trang 16

Information, but by the time I had the number it was long after five and no one answered the phone ‘Will you ring again?’ ‘I’ve rung them three times.’ ‘It’s very important.’ ‘Sorry I’m afraid no one’s there.’ I went back to the drawing room and thought for an in- stant that they were chance visitors, all these official people who suddenly filled it But as they drew back the sheet and looked at Gatsby with unmoved eyes, his protest continued in my brain ‘Look here, old sport, you’ve got to get somebody for me You’ve got to try hard I can’t go through this alone.’ Some one started to ask me questions but I broke away and going upstairs looked hastily through the unlocked parts of his desk—he’d never told me definitely that his par- ents were dead But there was nothing—only the picture of Dan Cody, a token of forgotten violence staring down from the wall Next morning I sent the butler to New York with a letter to Wolfshiem which asked for information and urged him to come out on the next train That request seemed super- fluous when I wrote it I was sure he’d start when he saw the newspapers, just as I was sure there’d be a wire from Daisy before noon—but neither a wire nor Mr Wolfshiem arrived, no one arrived except more police and photographers and newspaper men When the butler brought back Wolfshiem’s answer I began to have a feeling of defiance, of scornful

soli-darity between Gatsby and me against them all.

Trang 17

Information, but by the time I had the number it was long after five and no one answered the phone ‘Will you ring again?’ ‘I’ve rung them three times.’ ‘It’s very important.’ ‘Sorry I’m afraid no one’s there.’ I went back to the drawing room and thought for an in- stant that they were chance visitors, all these official people who suddenly filled it But as they drew back the sheet and looked at Gatsby with unmoved eyes, his protest continued in my brain ‘Look here, old sport, you’ve got to get somebody for me You’ve got to try hard I can’t go through this alone.’ Some one started to ask me questions but I broke away and going upstairs looked hastily through the unlocked parts of his desk—he’d never told me definitely that his par- ents were dead But there was nothing—only the picture of Dan Cody, a token of forgotten violence staring down from the wall Next morning I sent the butler to New York with a letter to Wolfshiem which asked for information and urged him to come out on the next train That request seemed super- fluous when I wrote it I was sure he’d start when he saw the newspapers, just as I was sure there’d be a wire from Daisy before noon—but neither a wire nor Mr Wolfshiem arrived, no one arrived except more police and photographers and newspaper men When the butler brought back Wolfshiem’s answer I began to have a feeling of defiance, of scornful

soli-darity between Gatsby and me against them all.

Copyright © 2015 McGraw-Hill Education All rights reserved No reproduction or distribution without the prior written consent of

McGraw-Hill Education.

ISSUES OF RELIABILITY AND VALIDITY

Reliability = consistency in procedures and in

reactions of participants

Validity = truth

Does it measure what it intended to measure?

Trang 18

Information, but by the time I had the number it was long after five and no one answered the phone ‘Will you ring again?’ ‘I’ve rung them three times.’ ‘It’s very important.’ ‘Sorry I’m afraid no one’s there.’ I went back to the drawing room and thought for an in- stant that they were chance visitors, all these official people who suddenly filled it But as they drew back the sheet and looked at Gatsby with unmoved eyes, his protest continued in my brain ‘Look here, old sport, you’ve got to get somebody for me You’ve got to try hard I can’t go through this alone.’ Some one started to ask me questions but I broke away and going upstairs looked hastily through the unlocked parts of his desk—he’d never told me definitely that his par- ents were dead But there was nothing—only the picture of Dan Cody, a token of forgotten violence staring down from the wall Next morning I sent the butler to New York with a letter to Wolfshiem which asked for information and urged him to come out on the next train That request seemed super- fluous when I wrote it I was sure he’d start when he saw the newspapers, just as I was sure there’d be a wire from Daisy before noon—but neither a wire nor Mr Wolfshiem arrived, no one arrived except more police and photographers and newspaper men When the butler brought back Wolfshiem’s answer I began to have a feeling of defiance, of scornful

soli-darity between Gatsby and me against them all.

Copyright © 2015 McGraw-Hill Education All rights reserved No reproduction or distribution without the prior written consent of

McGraw-Hill Education.

THREATS TO RELIABILITY AND VALIDITY

If measuring device cannot make fine distinctions

If measuring device cannot capture people/things that differ

When attempting to measure something irrelevant or unknown to respondent

Trang 19

Information, but by the time I had the number it was long after five and no one answered the phone ‘Will you ring again?’ ‘I’ve rung them three times.’ ‘It’s very important.’ ‘Sorry I’m afraid no one’s there.’ I went back to the drawing room and thought for an in- stant that they were chance visitors, all these official people who suddenly filled it But as they drew back the sheet and looked at Gatsby with unmoved eyes, his protest continued in my brain ‘Look here, old sport, you’ve got to get somebody for me You’ve got to try hard I can’t go through this alone.’ Some one started to ask me questions but I broke away and going upstairs looked hastily through the unlocked parts of his desk—he’d never told me definitely that his par- ents were dead But there was nothing—only the picture of Dan Cody, a token of forgotten violence staring down from the wall Next morning I sent the butler to New York with a letter to Wolfshiem which asked for information and urged him to come out on the next train That request seemed super- fluous when I wrote it I was sure he’d start when he saw the newspapers, just as I was sure there’d be a wire from Daisy before noon—but neither a wire nor Mr Wolfshiem arrived, no one arrived except more police and photographers and newspaper men When the butler brought back Wolfshiem’s answer I began to have a feeling of defiance, of scornful

soli-darity between Gatsby and me against them all.

Copyright © 2015 McGraw-Hill Education All rights reserved No reproduction or distribution without the prior written consent of

McGraw-Hill Education.

SOURCES OF VARIATION

Variation must represent true differences

Other sources of variation

Factors not measuredPersonal factors

Differences in situational factors

Differences in research administrationNumber of items measured

Unclear measuring device