Research question Is there evidence that the mean level of Salmonella in the ice cream is greater than 0.3 MPN/g?... Perform one sample t-test... So what …We do not have one sample t-tes
Trang 1t-test with Excel
Tâm Minh Lê, Ph.D Faculty of Food Technology, HUFI
17/05/2018 Stats with SPSS - Ch.12: Reliability 1
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01 One sample t-test
Trang 4An outbreak of Salmonella-related illness was attributed to ice cream produced at a certain factory Scientists measured the level of Salmonella in 9 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?
Trang 5Import data
17/05/2018 Stats with SPSS - Ch.12: Reliability 5
Trang 6Perform one sample t-test
Trang 7Perform one sample t-test
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Trang 8So what …
We do not have one sample t-test in Excel, so we do another
t-test combining with a trick Don’t let Excel know this !
Data | Data analysis
Trang 9Re-perform one sample t-test
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Data | Data analysis | t-test
Set µ
Add trick column
Trang 10Here are the results
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02 Independent samples
t-test
Trang 12Research question
Do electric solution and chemical solution differ
in terms of their effect ?
Trang 13Import data
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Trang 14Perform independent sample t-test
Data | Data analysis
Trang 15Perform independent sample t-test
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Check Labels
Data | Data analysis | t-test
Trang 16Here are the results
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03 Paired sample t-test
Trang 18Context: Alcohol and person’s ability to drive
Trang 19Context: Alcohol and person’s ability to drive
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A researcher selects a sample of 5 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
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Perform independent sample t-test
Data | Data analysis
Trang 22Perform independent sample t-test
Trang 23Here are the results
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