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t-test with Excel Tâm Minh Lê, Ph.D Faculty of Food Technology, HUFI 17/05/2018 Stats with SPSS - Ch.12: Reliability Content One sample t-test Independent samples t-test Paired-sample t-test 17/05/2018 Stats with SPSS - Ch.12: Reliability 01 One sample t-test 17/05/2018 Stats with SPSS - Ch.12: Reliability Context An outbreak of Salmonella-related illness was attributed to ice cream produced at a certain factory Scientists measured the level of Salmonella in randomly sampled batches of ice cream Research question Is there evidence that the mean level of Salmonella in the ice cream is greater than 0.3 MPN/g? 17/05/2018 Stats with SPSS - Ch.12: Reliability Import data 17/05/2018 Stats with SPSS - Ch.12: Reliability Perform one sample t-test 17/05/2018 Stats with SPSS - Ch.12: Reliability Perform one sample t-test 17/05/2018 Stats with SPSS - Ch.12: Reliability So what … Data | Data analysis We not have one sample t-test in Excel, so we another t-test combining with a trick Don’t let Excel know this ! 17/05/2018 Stats with SPSS - Ch.12: Reliability Re-perform one sample t-test Add trick column Data | Data analysis | t-test Set µ 17/05/2018 Stats with SPSS - Ch.12: Reliability Here are the results 17/05/2018 Stats with SPSS - Ch.12: Reliability 10 02 Independent samples t-test 17/05/2018 Stats with SPSS - Ch.12: Reliability 11 Context Electric solution Chemical solution Research question Do electric solution and chemical solution differ in terms of their effect ? 17/05/2018 Stats with SPSS - Ch.12: Reliability 12 Import data 17/05/2018 Stats with SPSS - Ch.12: Reliability 13 Perform independent sample t-test Data | Data analysis 17/05/2018 Stats with SPSS - Ch.12: Reliability 14 Perform independent sample t-test Data | Data analysis | t-test Check Labels 17/05/2018 Stats with SPSS - Ch.12: Reliability 15 Here are the results 17/05/2018 Stats with SPSS - Ch.12: Reliability 16 03 Paired sample t-test 17/05/2018 Stats with SPSS - Ch.12: Reliability 17 Context: Alcohol and person’s ability to drive 17/05/2018 Stats with SPSS - Ch.12: Reliability 18 Context: Alcohol and person’s ability to drive A researcher selects a sample of people and sets up an obstacle course Each subject drives the course, we count the number of cones that the subject knocks over Each subject was asked to drink a six-pack of beer Then, the subject drive the course again, and we count the number of cones she/he knocks over NOTE: Theory has shown that alcohol decreases motor and cognitive skills 17/05/2018 Stats with SPSS - Ch.12: Reliability 19 Import data 17/05/2018 Stats with SPSS - Ch.12: Reliability 20 Perform independent sample t-test Data | Data analysis 17/05/2018 Stats with SPSS - Ch.12: Reliability 21 Perform independent sample t-test 17/05/2018 Stats with SPSS - Ch.12: Reliability 22 Here are the results 17/05/2018 Stats with SPSS - Ch.12: Reliability 23 ... So what … Data | Data analysis We not have one sample t-test in Excel, so we another t-test combining with a trick Don’t let Excel know this ! 17/05/2018 Stats with SPSS - Ch.12: Reliability... question Is there evidence that the mean level of Salmonella in the ice cream is greater than 0 .3 MPN/g? 17/05/2018 Stats with SPSS - Ch.12: Reliability Import data 17/05/2018 Stats with SPSS... with SPSS - Ch.12: Reliability 12 Import data 17/05/2018 Stats with SPSS - Ch.12: Reliability 13 Perform independent sample t-test Data | Data analysis 17/05/2018 Stats with SPSS - Ch.12: Reliability