HP 12C#ABA hp 12c_solutions handbook_English_E.pdf - Page 79
b. Key in 2nd quarter sales and press 2.
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b. Key in 2nd quarter sales and press 2. c. Key in 3rd quarter sales and press 3. d. Key in 4th quarter sales and press 4. e. Key in the 1st quarter sales for the next year and press 5. 4. Press 00 to calculate the centered moving average for the 3rd quarter of the first year. 5. Press to calculate the seasonal variation for this quarter. 6. Key in the next quarter's sales and press average for the next quarter. to calculate the moving 7. Press to calculate the seasonal variation. 8. Repeat steps 6 and 7 for the balance of the data. Example: Econo-Wise Home Appliance Company had quarterly sales for the years 1978 thru 1980 as follows: Quarterly 1978 1979 1980 Sales (IN $K) 1st 2nd 3rd 397 376 460 455 390 530 513 434 562 4th 501 560 593 Find the centered 4-quarter moving average and seasonal variation factor for each quarter. Keystrokes Display CLEAR 0.00 397 1 397.00 376 2 376.00 460 3 460.00 501 4 501.00 455 5 00 455.00 440.75 Centered 4-element average for 3rd quarter, 1978 seasonal variation factor. 104.37 78