Which test is most appropriate for comparing pre-test and post-test scores?

a) one-way analysis of variance

b) paired t-test

c) independent samples t-test

d) correlation matrix

An ABAB single system research design:

Group of answer choices

a) is the most basic design.

b) studies two different interventions.

c) is the weakest of the single subject research designs.

d) consists of baseline-and intervention phases which are repeated.