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This chapter describes the differences between the independent-samples t test and the paired-samples t test, and shows how to perform both types of analyses. It develops an example of a research design that would provide data appropriate for a t test. With respect to the independent-samples test, the chapter shows how to write the necessary program using PROC TTEST, determine whether the equal-variances or unequal variances t test is appropriate, and interpret the results. With respect to the paired-samples test, it provides examples of paired-samples research designs, discusses problems with these designs, and shows how to perform the analysis using PROC MEANS and PROC TTEST.
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