or be tio be med? vide? cally 10. In a study of the effects of stress on illness, a re- searcher tallied the number of colds people con- tracted during a 6-month period as a function of the amount of stress they reported during that same time period. There were three stress levels: minimal, moderate, and high stress. The sums of squares appear in the following ANOVA sum- mary table. The mean for each condition and the number of subjects per condition are also noted. Source df MS F 22.167 14.750 Total 36.917 of rs, 6 SS ce Between groups Within groups 12 Stress Level Mean Minimal 3 4 Moderate 4 4 High 6 4 a. Complete the ANOVA summary table. b. Is Foh significant at a = .05? at a = .01? c. Perform post hoc comparisons if necessary. 310 1 CHAPTER 11 C 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. 13