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 why not?

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January 500 July February 520 August620 March 520 April 510 October 550 May 530 November 510 June 580 December 480 610 September 580