Question: in excel with shown work. formulas needed ng average. ... 4.9 Lenovo uses the ZX-81 chip in some of its laptop computers. The prices for

in excel with shown work. formulas needed

ng average. ... 4.9 Lenovo uses the ZX-81 chip in some of its laptop computers. The prices for the chip during the past 12 months were as follows: PRICE PER MONTH CHIP MONTH PRICE PER CHIP January February March April May June $1.80 1.67 1.70 1.85 1.90 1.87 July August September October November December 1.80 1.83 1.70 1.65 1.70 1.75 a) Use a 2-month moving average on all the data and plot the averages and the prices. b) Use a 3-month moving average and add the 3-month plot to the graph created in part (a). c) Which is better (using the mean absolute deviation): the 2-month average or the 3-month average? d) Compute the forecasts for each month using exponential smoothing, with an initial forecast for January of $1.80. Use a = .1, then a = .3, and finally a = .5. Using MAD, which a is the best? PX

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