The fictitious Haskin & Collins Ice Cream Store needs an accurate estimate of demand. The owner of the store believes that the demand for ice cream has a quarterly seasonal pattern. To analyze the pattern, the owner gathered the following quarterly ice cream sales data in gallons for the last 4 years:

Given this information:
1. Compute the quarterly seasonal indices for ice cream sales using the simple average method.

2. Compute the quarterly seasonal indices for ice cream sales using the centered moving average method.

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Year Quarter 3 4 January-March April-June July-September October-December 370 470 380 530 550 500 700 620 770 820 980 990 420 440 510 530 2.