A mail-order firm has found the following seasonal indexes for the number of calls received each month. Below the seasonal indexes is the actual number of calls (thousands) per month during 2009.
a. Using the seasonal indexes, deseasonalize the data for 2009.
b. The president of the firm is quite pleased that the number of calls went up each month during the May through December portion of 2009. Based on the results obtained in part (a), is the firm€™s performance really on the increase?

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Month: F M A MJA S O ND Seasonal index Calls in 2009 0 110 105 90 60 70 75 85 95 100 105 140 165 7.2 5.9 5.5 3.2 4.0 4.1 5.3 5.4 5.7 6 7.9 8.2