![]() ![]() The variable to be compared is a depression score. Patients have been followed at two different times (0: pre-test and 6: 6 months follow-up). The data correspond to an experiment in which depression is studied. If we had 30 plants for the morning measurements and 30 different plants for the afternoon measurements, the t-test for independent samples would be more appropriate. We say paired because every plant is measured twice, so data is organized by pairs. ![]() Student's paired t-test can be used to detect a change in photosynthesis between the two dates. For example: the photosynthetic rate of 30 plants is followed at two moments during the day: morning and afternoon. Student's paired t-test allows to compare the means of two series of measurements performed on the same statistical units. This tutorial will help you compare two observed means ( this guide).
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