A random sample of 60 12th-grade students were asked how long it took to get to school. The sample mean was 15.4 minutes and the sample standard deviation was 12.2 minutes.

What minutes would the 95% confidence interval be between and how could i find that?

Would a 90% confidence interval be wider or narrower than the 95%? and why would that be?

What minutes would a 90% interval be between? How do i find this?