When performing a significance test, be sure to check conditions and include hypotheses, level of significance, test statistic (show how the formula was used unless you are told you can pull values from a printout), P-value, and conclusion with an interpretation in words relevant to the problem. For each confidence interval, be sure to check conditions; show how the formula was used; give the interval with endpoints carried out four places past the decimal; and, if an interpretation is requested, interpret completely in words relevant to the problem. 19. You may use the Minitab output below. You do not need to calculate the interval. The drug Lipitor is meant to lower cholesterol levels. In a clinical trial of 863 patients who received 10 mg doses of Lipitor daily, 47 reported having a headache as a side effect. Construct a 95% confidence interval for the proportion of all Lipitor users who will report having a headache as a side effect. Test and Cl for One Proportion Sample X N Sample p 958 CI 47 863 0 . 054461 (0. 039321, 0. 069601) a. Interpret the interval. b. Calculate a 99% confidence interval for the above problem. You do not have to interpret the interval in this step. Compare the two intervals. How do they differ