Western Pygmy-Possum. Refer to Problem 12.

a. Find the percentage of all samples of four pygmy-possums that have mean weights within 0.225 g of the population mean weight of 8.5 g.

b. Obtain the probability that the mean weight of four randomly selected pygmy-possums will be within 0.225 g of the population mean weight of 8.5 g.

c. Interpret the probability you obtained in part

(b) in terms of sampling error.

d. Repeat parts (a)–

(c) for samples of size 9.