Refer to the Costello Music Company problem in exercise 49.
a. Using time series decomposition, compute the seasonal indexes for the four quarters.
b. When does Costello Music experience the largest seasonal effect? Does this result appear reasonable? Explain.
In Exercise 49

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Total Yearlv Sales 12 28 34 50 76 Year Quarter 1 Quarter Quarter 3 Quarter 4 4 4 4 10 12 18 14 16 20 35 4 10 13