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.

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Stock Market Indices

Stock indexes are used to compare the price fluctuations of a group of stocks of similar companies, which are combined based on a similar industry or a particular market capitalization limit or type of market. The price comparison is based on a pre-determined standard method or indicators. These stock indexes are usually considered a base for comparison of a particular stock, and the performance of that particular company can be easily determined.