Question: A health educator suspects that the "days of discomfort" caused by common colds can be reduced by ingesting large doses of vitamin C and visiting a sauna every day. Using a two-factor design, subjects with new colds are randomly assigned to one of four different daily doses of vitamin C (either 0, 500, 1000, or 1500 milligrams) and to one of three different daily exposures to a sauna (either 0, 0.5 or 1 hour). The number of days spent suffering from cold symptoms for each group are shown below.

a. Code your data and carry out the appropriate parametric analysis using SPSS. Choose descriptives and homogeneity of variance tests from the options menu and any post hoc tests you feel would be appropriate. Please provide me with your output and interpretation of it. (At least half the points are on interpretation, so please don’t skimp on this!) (4 points)

b. Do either (or both) of the treatments significantly reduce the number of days of discomfort? Explain! (3 points)

c. Is there a significant interaction between the two treatments? Explain. (2 points)

d. Whether or not there was an interaction in this specific case, please explain what an interaction would mean / have meant in this case. (i.e. if there was an interaction, what would this tell you?) 2 points.