Question: Table 2.1: Actual sales data for the reading glasses during 2021 Month Actual Sales (Pairs of reading glasses) January 2021 2 800 February 2021 3

Table 2.1: Actual sales data for the reading glasses during 2021

Month	Actual Sales (Pairs of reading glasses)
January 2021	2 800
February 2021	3 000
March 2021	5 000
April 2021	4 000
May 2021	5 600
June 2021	8 000
July 2021	8 000
August 2021	7 900
September 2021	6 000
October 2021	4 050
November 2021	4 900
December 2021	5 550

4.2 Determine the Mean Absolute Deviation (MAD) of the three-month-weighted-movingaverage monthly forecasts for the April - December 2021 period. (4 marks)

a. The linear regression equation of the sales of reading glasses for the 2021 financial year is given by the expression: y = 201.4x + 4091 (where 'y' denotes monthly sales, and 'x', the number representing the month. For example, x = 1, 2, 3, etc., if the month is January, February, March, etc.). Use the regression equation to determine the Mean Absolute Deviation (MAD) of the regression forecasts for the April - December 2021 period. .(5 marks)

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