Confidence intervals

In the two sample t test of the previous example the printout from the command {\tt twosample} also included a confidence interval for the unknown mu[west]-mu[north].

To obtain a confidence interval for the unknown mean mu in the one-sample data problem of Case Study 9.2. use the command interval. If you have left Minitab since going through the example in Section 3, you need to first repeat entering the data. Then type:

	tinterval 95 'SLEEP'

to obtain a 95% confidence interval for the unknown mu.

Question: State the 95% confidence interval for mu.