Question 3 (10 marks) In order to ensure efficient usage of a server, it is necessary to estimate the mean number of concurrent users. According to records, the sample mean and sample standard deviation of a number of concurrent users of 100 randomly selected times is 37.7 and 9.2, respectively. 3.1 Construct a 90% confidence interval for the mean number of concurrent users. (5) 3.2 Do these data provide significant evidence, at 1% significance level, that the mean number of concurrent users is greater than 35? Give a reason for you answer/outcome