The owner of a convenience store near Salt Lake City in Utah has been tabulating weekly sales at the store, excluding gas. The accompanying data file contains the sales for 30 weeks. Week Sales 1 5387 2 5522 3 5307 4 5503 5 5391 6 5500 7 5283 8 5178 9 4833 10 5013 11 5040 12 5420 13 5114 14 5076 15 4929 16 5231 17 4998 18 4920 19 4974 20 4889 21 5062 22 4727 23 5111 24 5385 25 5036 26 4868 27 5037 28 5354 29 5018 30 5206   1. Use the 3-period moving average to forecast sales for the 31st week. Note: Do not round intermediate calculations. Round final answer to 2 decimal places.   2. Use simple exponential smoothing with α = 0.3 to forecast sales for the 31st week. Note: Do not round intermediate calculations. Round final answer to 2 decimal places.   3. Report the performance measures for the techniques in parts a and b. Note: Do not round intermediate calculations. Round final answers to 2 decimal places.   4. What is the preferred technique for making the forecast?

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