Solution: A researcher conducted an experiment on the effects of a new "drug" on depression. The researcher had a control group that received nothing,


Question: 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 p
Between 1202.313
Within 2188
Total 3320.313

  1. Complete the ANOVA summary table.
  2. Is \(F_{obs}\) significant at \(\alpha=05\); at \(\alpha=.01 ?\)
  3. Perform post hoc comparisons if necessary.
  4. What conclusions can be drawn from the F-ratio and the post hoc comparisons?
  5. What is the effect size, and what does this mean?
  6. Graph the means.

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