A random sample of 64 completion times for a task gave a sample mean of 35 secs and a sample standard deviation of 16 secs. What is the 95% confidence interval for the population mean completion time?...

A random sample of 64 completion times for a task gave a sample mean of 35 secs and a sample standard deviation of 16 secs. What is the 95% confidence interval for the population mean completion time?

5. Would the above interval be wider or more narrow than the 90% confidence interval?