ces Exercise 10-1 Algo Consider the following data drawn independently from normally distributed populations: (You may find it useful to reference the appropriate table: z table or table) x1 = 31.6 X2 = 26.8 012 = 91.9 n1 = 20 02 = 90.0 n2 = 26 a. Construct the 99% confidence interval for the difference between the population means. (Negative value should be indicated by a minus sign. Round final answers to 2 decimal places.) Confidence interval is to b. Specify the competing hypotheses in order to determine whether or not the population means differ. Ho: H1 H2 = 0; HA: 41 - 42 * 0 Ho: H1 H2 0; HA: 41 - 42 < 0 Ho: H1 H2 0; HA: 41 - 42 > 0