If a variable is measured in an experiment at time 1 (pretest)and again at time 2 (posttest),the most appropriate t-test would be

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The related samples t-test (also known as paired samples t-test or dependent samples t-test) is the most appropriate choice when the same group of participants is measured at two different time points or under different conditions. In this case, we have two measurements from the same group of participants (pretest and posttest), so we need to use the related samples t-test. The purpose of this test is to assess whether there is a significant difference between the means of the two related groups.

If a Variable Is Measured in an Experiment at Time