14. 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). Here are the summary findings, displayed as "mean (standard deviation)" Low-Protein Diet 101.3 (20.6) High-Protein Diet 127.5 (21.1) Researchers want to know if the amount of protein in the rats' diet significantly affects their weight gain. What are the corresponding null and alternative hypotheses? = a. Ho High Low = Vs. H, HHigh > Low Vs. H High Low b. Ho High Low C. Ho: "High = 127.5 and Low = 101.3 d. Ho High = "Low Vs. H, High > Low Vs. H High =127.5 and Low = 101.3 15. Based on the data, software gives the T-statistic=2.35 with df=12. Researchers want to know if the amount of protein in the rats' diet significantly affects their weight gain. What should they conclude at significance level 5%? a. Reject the alternative hypothesis b. Fail to reject the alternative hypothesis c. Reject the null hypothesis d. Fail to reject the null hypothesis