The data below consist of the closing price of the common stock of the American Telephone and Telegraph Corporation on 10 recent trading days. Time(t) Price Time(t) Price 1 $24.10 6 $22.73 2 23.80 7 22.60 3 23.39 8 21.76 4 22.90 9 22.14 5 22.10 10 21.69 a. Using a five-period moving average, forecast the price of the stock for period 10. b. What is the error of the forecast in #1-a? c. Using a five-period moving average, forecast the price of the stock for period 11.