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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% confidence interval for the population mean number of wolf pups per den in the southwestern United States.

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