Steps of single samples t test
• Know what single samples look like
o One column
• Go to analyze
o Compare means
o One sample t test
o Move the variable into the test variable box
o The test value, is the null hypothesis
o Set test value to 100
o Press ok
o P value tells you if the null hypothesis is true assuming that the population
mean is a 100
o Most imp info on this output is the p value, it is located under the heading
sig 2 tail
o In this scenario, p = .000, therefore, p is less than .05, and in fact, p is less
than .001
o Example: t (df) = t value, p is < .001 or .01 or .05
o We therefore, reject the null hypothesis
o If it was bigger than .05, you would use ns
Independent groups t test steps
• 2 columns
• Go to
o Analyze
o Compare means
o Independent samples t test
o Put the DV into the test variable box
Example: ratings
o Put the IV into the grouping variable box
Example: University
o Click define groups
o Put 1 into group 1 box
o Put 2 into group 2 box
o Click continue and hit ok
o If variances are the same, use top line, if different, use the bottom line
o The first two numbers under lavene’s test for a quality of variances, tell
you which line to use
o If significance is .05, or bigger, use the top line
o If sig is .05 or less, use bottom line
Example: f (1, 98) = 5.21, p

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