Scrapper Elevator Company has 20 sales representatives who sell its product throughout the United States and Canada. The number of units sold last month by each repre-sentative is listed below. Assume these sales figures to be the population values.

a. Draw a graph showing the population distribution.

b. Compute the mean of the population.

c. Select five random samples of 5 each. Compute the mean of each sample. Use the methods described in this chapter and Appendix B. 6 to determine the items to be included in the sample.

d. Compare the mean of the sampling distribution of the sample means to the popula-tion mean. Would you expect the two values to be about the same?

e. Draw a histogram of the sample means. Do you notice a difference in the shape of the distribution of sample means compared to the shape of the population distribution?