15 and 16 please

A simple random sample with n-17 provided a sample mean of 20 and sample standard deviation of 21% Develop 90% confidence interval for the population mean. a) 16.508 - 23.492 b) 16.62 - 23.38 Oc) 19.127 - 20.873 d) 15.635 - 24.365 Question 16 (5 points) A simple random sample of 25 items resulted in a sample mean of 30. The population standard deviation is a -15. Compute the 95% confidence interval for the population mean. a) 25.065-34.935 b) 28.824 - 31.176 c) 24.33 - 35.367 d) 24.12 - 35.88