please help with answering these questions

A metropolitan transportation authority has set a bus mechanical reliability goal of 3,900 bus miles. Bus mechanical reliability is measured specifically as the number of bus miles between mechanical road calls. Suppose a sample of 100 buses resulted in a sample mean of 3,925 bus miles and a sample standard deviation of 225 bus miles. Complete parts (a) and (b) below. a. Is there evidence that the population mean bus miles is more than 3,900 bus miles? (Use a 0.01 level of significance.) State the null and alternative hypotheses. Ho:H S 3900 H: u > 3900 (Type integers or decimals.) Find the test statistic for this hypothesis test. STAT = 1.11 (Round to two decimal places as needed.) The critical value(s) for the test statistic is(are). (Round to two decimal places as needed. Use a comma to separate answers as needed.)An auditor for a government agency was assigned the task of evaluating reimbursement for office visits to physicians paid by government medical insurance. The audit was conducted on a sample of 88 reimbursements, with the following results: * In 14 of the office visits, there was an incorrect amount of reimbursement. . The amount of reimbursement was X = $94.15, S = $32.99. Complete parts (a) through (e) below. a. At the 0.01 level of significance, is there evidence that the population mean reimbursement was less than $100? Determine the null hypothesis, Ho, and the alternative hypothesis, H,. Ho: H 2 100