A researcher interested in the effects of exercise on stress had participants exercise for 30, 60, or 90 minutes per day. The mean stress level on a 100-point stress scale (with 100 indicating high stress) for each condition appears next, along with the ANOVA summary table with the sums of squares indicated.

a. Complete the ANOVA summary table.

b. Is F_obt significant at α = .05; at α = .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.

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Source df MS Between groups Within groups Total 4,689.27 82,604.20 87,293.47 Exercise Level Mean п 30 minutes 75.0 10 60 minutes 44.7 10 90 minutes 63.7 10