Comparing Before and After Scores: The Dependent t-Test

The appropriate test to compare before and after scores on a treatment group would be the Dependent t-test. This test, also known as the paired t-test, is used to determine if there is a statistically significant difference between two sets of related data, where each data point in one set is paired with a corresponding data point in the other set. In this case, the 'before' scores are paired with the 'after' scores for each individual in the treatment group.