Refer to the Arkansas Business and Economic Review

(Summer 1995) study of hazardous waste sites in Arkansas counties, Exercise 2.37

(p. 61). An SAS descriptive statistics printout for the number of Superfund waste sites in each of the 75 counties is displayed here.

a. Find the 10th percentile of the data set on the printout. Interpret the result.

b. Find the 95th percentile of the data set on the printout. Interpret the result.

c. Use the information on the SAS printout to calculate the z-score for an Arkansas county with 48 Superfund sites.

d. Based on your answer to part

c, would you classify 48 as an extreme number of Superfund sites?