1. 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)":
3. Low-Protein DietHigh-Protein Diet
4. 101.3 (20.6)127.5 (21.1)
6. Researchers want to know if the amount of protein in the rats' diet significantly affects their weight gain. Based on the data, what is the absolute numerical value oftstatistic for the appropriate test?
7. 1.25
8. 2.35
9. 6.04
10. 13.10