Unit 3 · Compare groups
How to run an independent-samples t-test in SPSS
Run and interpret an independent-samples t-test in SPSS, including Levene's test, Cohen's d and an APA write-up.
Pro lessonAbout 5 minutes7 practice questions
Independent-samples t-test
Use it when two separate groups each give one score, and you want to know whether the group means differ. Example: online vs in-person students' exam scores.
Independent-Samples T Test
Options…Bootstrap…
✓Estimate effect sizes4
OKPaste5ResetCancelHelp
- 1
Test Variable(s)The outcome you're comparing. It must be Scale, such as score.
- 2
Grouping VariableThe variable that splits people into the two groups.
- 3
Define Groups…Tells SPSS which codes to compare: type 1 for Group 1 and 2 for Group 2. Until you do, it shows teaching(? ?) and OK stays greyed out.
- 4
Estimate effect sizesAvailable in SPSS 27 and later. Adds Cohen's d so you can report how big the difference is.
- 5
PasteGives you the T-TEST syntax.
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