a. Assuming valid random samples, test at .05 whether differences can be attributed to chance fluctuation or, indeed, to actual differ- ences among the three groups. b. Briefly discuss the implications of these results. c. If appropriate, use the Marascuilo procedure (a = 0.05) to determine which group propor- tions are significantly different.10. 14 The common cold may be more common in some, depending on the level of stressful conditions in your life. Suppose researchers at Carnegie Mellon University and S.U.N.Y. Medical School at Stony Brook administer nasal drops containing a cold vi rus to 360 healthy men and quarantine these men for several days to see who develops a cold, with the following results:14 Recent Stress Long Term Relatively at Work: Inter-Personal Stress- Cn'ticism Enduring Free by One's Boss, Problems Irritating Encounters, Heavy Workload