Indusrial Engineering, Des & Analy Experiments

please help me out guys.

A research study was conducted to examine the clinical efficiency of a new antidepressant. Depressed patients were randomly assigned to one of three groups: a placebo group, a group that received a low dose of the drug, and a group that received a moderate dose of the drug. After four weeks of treatment, the patients completed the Back Depression Inventory. The higher the score, the more depressed the patient. The data is presented below. Compute the appropriate test. What would be the null hypothesis in this study? What would be the alternate hypothesis? What probability level did you choose and why? What is your F_critical? Is there a significant difference between the groups (JUSTIFY)!? If there is a significant difference, where specifically are the differences? Interpret your