A researcher conducted an experiment on the effects of a new drug on depression. The researcher had a control group that received nothing, a placebo group, and an experimental group that received the drug. A depression inventory that provided a measure of depression on a 50-point scale was used (50 indicates that an individual is high on the depression variable). The ANOVA summary table appears next along with the mean depression score for each condition.

Source df SS MS F

between groups1,202.313

Within Groups2,118.00

Total3,320.313

Stress Level Mean N

Control 36.2615

Placebo 33.3315

Drug24.13 15

a) Complete the ANOVA summary table

b) Is F obt significant at a = .05; at a = .01?

c) perform post hoc comparisons if necessary.

d) What conclusions can be drawn from the F-ratio and the post hoc comparisons,?

e) What is the effect size, and what does this mean?

f) graph the means.

Please show all calculations and explain.