Refer to the data for problem 11. Continue using the logarithms of the lengths of calls.
a. Find the total sample size, n, the grand average, X, and the number of samples, k.
b. Find the between-sample variability and its degrees of freedom.
c. Find the within-sample variability and its degrees of freedom.

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TABLE 15.5.3 Lengths of Telephone Calls Information Sales Service Other 6.3 1.2 0.6 5.1 5.2 2.9 2.6 1.2 7.0 14.2 8.4 0.6 4.4 26.6 7.4 2.5 3.0 2.6 0.8 3.8 0.4 0.6 2.2 12.3 4.2 2.8 7.0 3.9 26.7 1.2 7.7 173 7.8 4.3 3.4 1.3 2.0 7.2 2.7 3.4 13.3