An Experimental Psychologist at a VA Hospital Obtained Approval from the Institutional

Essay

An experimental psychologist at a VA hospital obtained approval from the Institutional Review Board to conduct a study of the efficacy of a new drug for treatment of depression. Clinically depressed patients were given a placebo, a low dose, or a high dose of the drug. After 60 days the patients were observed by two outside psychologists who rated several different behaviors (eye contact, posture, verbal output, activity, and such) for degree of depression. A composite score was obtained on each patient, with low scores indicating depression. Perform an ANOVA on the scores below. Construct a summary table. Find the effect size index. Examine the group means and pick one informative comparison and perform a Tukey HSD test and find d. Explain the results without too much statistical jargon.
-Data Set 6b $$\begin{array} { r c c } \text { Placebo } & \text { Low Dose } & \text { High Dose } \\\hline 12 & 18 & 16 \\8 & 24 & 7 \\15 & 16 & 14 \\13 & 30 & 10 \\6 & 26 & 8 \\7 & 27 & 10\end{array}$$ Fill in: Independent variable: ____________Dependent variable: __________