In the SPSS procedure for using the Independent samples t Test, the "Test variable" in the dialog box, refers to the:

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The Independent samples t Test is used to compare the means of two independent groups on a continuous dependent variable. The "Test variable" in the dialog box refers to the continuous variable that will be used to compare the means of the two groups, which in this case would be the gain score (i.e., the difference between the posttest score and the pretest score).

In the SPSS Procedure for Using the Independent Samples T