16. A study examined the effect of protein consumption on weight gain in rats. Investigators obtained 14 female rats and randomly assigned 7 of them to a low-protein diet and the other 7 to a high-protein diet. After 60 days, the weight gained by each rat was recorded, in grams. The summary findings, displayed as "mean (standard deviation)", are: Low-Protein Diet High-Protein Diet Hlow = 101.3 (Slow = 20.6) Hhigh = 127.5 (Shigh = 21.1) (1) (4 points) Find the degree of freedom, of, and the critical value t* for the degree of freedom. (2) (3 points) Find a 95% confidence interval for high - Hlow- Answer in "Estimate + Margin of Error (3) (3 points) Which of the following statements would lead us to believe that the tt procedures were NOT safe to use here? A. The experiment was not double-blinded. B. The distributions of the data were skewed or had outliers. C. The population standard deviations were not known. D. The tt procedures are always safe to use in a randomized experiment