Consider the following actual data for sales during the 12 months of 2012. Month Actual Sales Three-Month

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Consider the following actual data for sales during the 12 months of 2012.

Month Actual Sales Three-Month Moving Average MAD1 MAD2 January 71,290 February 70,912 March 62,540 April 64,258 May 68,912 June 70,512 July 72,436 August 70,887 September 68,500 October 64,312 November 61,850 December 66,275

(a) Fill in the third column of 3-month moving average.

(b) Calculate the forecast value of sales in January of 2013.

(c) Calculate the forecast value of sales in February 2013 if January sales turn out to be 70,937.

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