A Study Examined the Effect of Protein Consumption on Weight $$\begin{array}{l}\begin{array} { l l } \text { Low-Protein Diet}&\text { High-Protein Diet}\\101.3(20.6)&127.5(21.1)\end{array}\end{array}$$

Multiple Choice

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 in a high-protein diet. After 60 days, the weight gained by each rat was recorded (in grams) . Here are the summary findings, displayed as "mean (standard deviation) ":
$$\begin{array}{l}\begin{array} { l l } \text { Low-Protein Diet}&\text { High-Protein Diet}\\101.3(20.6) &127.5(21.1) \end{array}\end{array}$$ Given that the degrees of freedom for the appropriate t procedure is approximately 12, what is a 95% confidence interval for ?_High - ?_Low?

A) 1.9 to 50.5 grams
B) 15.1 to 37.3 grams
C) 20.6 to 21.1 grams
D) 101.3 to 127.5 grams