A clinical psychology researcher wants to know if cognitive behavioral therapy (CBT) + Meditation is more effective at treating anxiety than CBT alone. The psychologist randomly assigns one group of 9 patients to a 4-month course of CBT + Meditation treatment. Another group of 9 patients is assigned to a "CBT-only" group. At the end of 4 months, every patient is asked to take the Beck Anxiety Inventory, as a measure of their anxiety level. Higher scores on this questionnaire represent higher anxiety levels. (Hint: For help, follow steps on pages 278 – 279 in your textbook) CBT + Meditation Group CBT-Only Group n = 9 n = 9 M = 3.78 M = 6.33
1. Write out the null hypothesis and the alternative hypothesis for this independent measures study both in statistical terms and in English.
2. Find the degrees of freedom and the critical region, using a two-tailed .05 alpha level.