A researcherconducted a study on the effects of stress on migraines. The researchercomputed the number of migraines individuals reported during a six-month timeframe as a function of the amount of...

A researcher conducted a study on the effects of stress on migraines. The researcher computed the number of migraines individuals reported during a six-month time frame as a function of the amount of stress they reported during that same time period. There were three stress levels: low, mild, and severe. The sums of squares appear in the following ANOVA table. The means for each condition and the number of participants per condition are also provided.

a) Complete the ANOVA summary table.

b) Is F_obt
significant at a = .05?

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 it mean?