QUESTION 4 Assume that data for a sample of 69 individuals were recorded on systolic blood pressure (Y), age (X), and sex (Z) that includes two categories (Z= 1 if female and Z = 0 if male). The following SAS output is based on the data analysis. Consider that the overall mean of (for the combined data of both males and females) = 46.14. Regressing of Y on X Dependent Variable: y 'SBP' DF Sum of Squares Mean Square F Value Pr> F Source Model 1 14951.25461 14951.25461 121.27 Dependent Variable: y 'SBP' DF Sum of Squares Mean Square F Value Pr > F Source Model 2 18009.77936 9004.88968 114.25 F Source Model 3 18010.32871 6003.44290 75.02 Consider that Y = + X + Z + E 0 1 2 d) Based on the calculated confidence interval in part (c), is the difference in adjusted means of responses for males and females significant using a = 0.01. Explain. The difference in adjusted means of responses for males and females is not significant because the 99% confidence interval does not include 0. The difference in adjusted means of responses for males and females is not significant because the 99% confidence interval does not include 0.01. The difference in adjusted means of responses for males and females is significant because the 99% confidence interval does not include 0. The difference in adjusted means of responses for males and females is significant because the 99% confidence interval does not include 0.01.