In which statistical test does one calculate a difference score for each individual, take the mean of the difference scores, and perform a test on them to compare two sample means?
A) between-groups design
B) paired-samples t test
C) z test
D) single-sample t test

Question

Quizplus · Accepted Answer

The paired-samples t test involves calculating a difference score for each individual by subtracting their score on one condition from their score on another condition (e.g. before and after a treatment). The mean of the difference scores is then calculated and a t test is performed to compare this mean to a hypothetical mean (usually 0). This test is most appropriate when comparing two sample means in which the same participants are included in both conditions.

In Which Statistical Test Does One Calculate a Difference Score