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:

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 thebest?

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PRICE PRICE MONTH , PER CHIP | MONTH | PER CHIP JANUARY 妙01嬲12AEY MARCEH APRIL 1.80 1.83 1.70 SEPTEMBER 1.70 1.65 1.90I NOVEMBER 1.70 〕l.碯/ Al2@ะเ251. AUGUST 1.85 OCTOBER MC JUNE