Imagine the following experiment: Male lab rats were randomly assigned to 3 groups differing in access to food for 40 days. The 3 groups are; chow only, chow + protein supplement, and chow + carbohydrate supplement. The rats were weighed (in grams) at the end to measure weight gain. What is the response variable? What is your null hypothesis? What test should we use to compare the groups? If your p-value < 0.05 then what can you conclude? You run a Tukey’s HSD test and find that only group 3 (chow + carbohydrate) is statistically different from the other groups, how do you explain this finding in general terms?

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