Refer to the data of Exercise 3.55.
In exercise

a. Compute the standard deviation in the expenditures separately for each of the five groups.
b. Combine the five data sets into a single data set and then compute the standard deviation in expenditures.
c. Describe a method by which the standard deviation for the combined data set could be obtained from the five individual standard deviations.
d. Which group appears to have the largest variability in expenditures?

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