<prompt> In a clinical trial, blood pressure was measured in a group of patients before and after treatment, which of the following tests will be suitable as a test of significance:Paired t-testMann-Whitney U testStudent t-testANOVA  <response>: Ans. A. Paired t-testUnpaired t-test aka Students test compares two different subjects. The paired t-test reduces intersubject variability because it makes comparisons between the same subject, and thus is theoretically more powerful than the unpaired t-test.In our case, we are analyzing the same subject twice that is before and after. 