13. Ten individuals have been assigned to a program of diet and exercise. Weight measurements were taken before the program started and again after 2 months. At a significance level of a = 0.05, is the program effective in reducing weight? Discuss the decision-making process regarding the hypothesis test using these data. Assume that the samples follow a normal distribution. Weight (kg) 1 2 3 4 5 6 7 8 9 10 Before 59 21 33 78 70 33 68 32 54 52 After 53 22 36 74 64 35 67 28 41 44