The following data represent random samples taken from two different populations, A and B:

A 31 10 69 25 62 61 46 74 57 B 1,030 1,111 1,155 978 943 983 932 1,067 1,013

a. Compute the mean and standard deviation for the sample data randomly selected from population A.

b. Compute the mean and standard deviation for the sample data randomly selected from population B.

c. Which sample has the greater spread when measured by the standard deviation?

d. Compute the coefficient of variation for the sample data selected from population A and from population B. Which sample exhibits the greater relative variation?