Confidence interval for the population mean.
The number of pups in wolf dens of the southwestern United States is recorded below for 16 wolf dens.
5

8

7

5

3

4

3

9

5

8

5

6

5

6

4

7

(a) Use a calculator with mean and standard deviation keys to verify that the sample mean is x = 5.63 pups with the sample standard deviation s = 1.78 pups.
(b) Find a 75 percent confidence interval for the population mean number of wolf pups per den in the southwestern United States.