Physical Therapy Evaluation Tool (PEAT) 4 Practice Exam

What does a Paired T test compare?

Compares difference between 2 matched samples Compares difference between 2 independent samples Compare 2 or more treatment groups while controlling the effects of variables Relationship between 2 variables

Correct Answer:

Compares difference between 2 matched samples

Explanation:

A paired t test compares the means of two related measurements to see if there is a significant average difference between them. The key idea is that the two samples are linked: you measure the same subjects twice (before and after), or you measure matched pairs, so the analysis focuses on the differences within each pair. By analyzing these difference scores, you control for inter-subject variability and increase the power to detect a real change. This is different from comparing two independent groups, which uses an independent samples t test. It’s also not intended for analyzing more than two groups or for examining the relationship between two variables, which would involve ANOVA, regression, or correlation.

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