You have the following data for the last 12 months' sales for the PRQ Corporation (in thousands of dollars):

a. Calculate a 3-month centered moving average.
b. Use this moving average to forecast sales for January of next year.
c. If you were asked to forecast January and February sales for next year, would you be confident of your forecast using the preceding moving averages?  Why or whynot?

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610 January February 520 March April May June 500 July August September 580 October Novebe 510 December 480 620 520 510 530 580 550