Suppose that a population consists of the values 11, 13, 15, 17, and 20. Do the following: (a) find the population mean, variance, and standard deviation; (b) list all possible samples of size 2...

Suppose that a population consists of the values 11, 13, 15, 17, and 20. Do the following:

(a) find the population mean, variance, and standard deviation;                    (b) list all possible samples of size 2 selected without replacement; and        (c) find the mean, variance, and standard deviation of the sampling distribution.