A researcher wants to evaluate the effectiveness of cognitivebehavior therapy which he thinks will decrease depression scores.Prior to testing, each of n = 10 patients rated their current levelof depression on a self-report survey. After attending cognitivebehavior therapy for a month, a second rating is recorded. The dataare as follows:
          Before   After
                                                5          2
                                                7          7
                                                10         7
                                                14         10
           Â
Do the results indicate a significantdifference? Use α = .01. If so, what percent of the decrease isactually due to the therapy?
