statistics 8

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 very 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 groups                                          1,202.313 

Within groups                                              2,118.00 

Total                                                             3,320.313

Drug condition                          Mean                n

Control                                     36.26                15

Placebo                                   33.33                15

Drug                                        24.13                 15

A.  Complete the ANOVA summary table

B.  Is Fobt significant at a = .05; at a = .01?

C.  Perform post hoc comparisons if necessary.

D.  What conclusion 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.

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