The questions are numbered 9,10,11,12, and 13

Which Z-value would be used to calculate a confidence interval at 74% 0.What is the upper bound on a 96% confidence interval, when: mean = 70, o = 11, N = 90 1.What is the upper bound on a 96% confidence interval, when: mean = 85 0 = 32, N = 111 2. Gallup Polls has collected data to estimate the nation's approval rating (0-10) for President Simpson. After randomly sampling 20,000 citizens, hey find the average approval rating is 5.1 with a The standard deviation of 1.6. Construct a 98% confidence interval to determine the lower bound of approval ratings (to two decimals). 13. Gallup Polls has collected data to estimate the nation's approval rating (0-10) for President Simpson. After randomly sampling 20,000 citizens, they find the average approval rating is 5.1 with a standard deviation of 1.6 Construct a 98% confidence interval to determine the lower bound of approval ratings (to two decimals)