In an experiment designed to study of the effect of exercise on a person's heart rate, five subjects were tested. Their heart rates were measured before and after climbing four flights of stairs. a) To test if exercise will increase a person's heart rate, which of the following sets of hypotheses is correct? Let Difference = Before - After. a) H0: mu_d > 0 versus Ha: mu_d = 0 b) H0: mu_d =0 versus Ha: mu_d > 0 c) H0: mu_d =0 versus Ha: mu_d < 0 d) H0: mu_d =0 versus Ha: mu_d is not equal to 0 b) The mean of the differences is -13.32 and the standard deviation of the differences is 8.91. Calculate the test statistic. (Round to 2 decimal places) c) Calculate the p-value using Minitab or other software. Which of the following interval contains the p-value? a) (0.05, 0.10) b) (0, 0.01) c) (0.10. 1.00) d) (0.01, 0.05) d) Make decision and draw conclusion. Let alpha = 0.05. a) Reject the null. There is not sufficient evidence that exercise increases heart rate. b) Fail to reject the null. There is not sufficient evidence that exercise increases heart rate. c) Reject the null. There is sufficient evidence that exercise increases heart rate. d) Fail to reject the null. There is sufficient evidence that exercise increases heart rate. e) Suppose the sample mean difference is -13.38. Calculate a 95% confidence interval for the population mean difference. What is the upper bound of the interval? (Round to 2 decimal places)