An outpatient clinic for clinical depression commissioned an evaluation of the efficacy of their services. They randomly sampled and administered a normed clinical depression inventory to 30 patients during two time points. The first time point was just before the first therapy session. The second session was after the sixth therapy session. The administrators of the outpatient clinic wanted to know if there was a significant reduction in clinical depression after the six sessions of therapy. What is the null and alternate hypothesis for this study?