You were interested in how long the average psychology major at your college
studies per night, so you asked 10 psychology majors to tell you the amount
they study. They told you the following times: 2, 1.5, 3, 2, 3.5, 1, 0.5, 3, 2, 4.
(a) Find the 95% confidence interval on the population mean. (b) Find the 90%
confidence interval on the population mean.