2. Out of 26 randomly.r selected users of a financial application 25 were able to create an expense report using this application. A. Construct a 95% confidence interval for the proportion of users who are_a_l:_)_|_tg create an expense report using this application. report using this application. C. How mam,f people should be selected so that the margin of error is at most 4% and the confidence level is 95%? Assume that no previous information is provided. 3. The following are 15 randomly selected system useahilitv scores [SUS] from a test of an automotive website. 70, 50, 57.5, 35, 2?.5, so, 30, 3?.5, 65, 45, 32.5, 30, 47.5, 32.5, 65 A. Find the 99% confidence interval for the average SUS score. B. Find the 95% confidence interval The 90% confidence interval : (36.1728, 39.2272) b. B. If the test is to be repeated, what should the sample size be so that the confidence level is 95% and the length of the confidence interval does not exceed 2.5?1. In order to ensure efficient usage of a server, it is necessary to estimate the mean number of concurrent users. A random sample of 100 times gave a mean of 37.7 users and standard deviation of 9.2 users