The following time series shows the sales of supermarket chain over the last six months.  Month Sales ($ 000) August 2021 250 Sep 2021 280 Oct 2021 295 Nov 2021 320 Dec 2021 380 Jan 2022 360   Develop a linear trend equation that can be used to forecast sales in Feb 2022. Forecast the sales in Feb 2021 using a three-period weighted moving average designed with the following weights: Nov 2021 weight 0.6, Dec 2021 weight 0.3 and Jan 2022 weight 0.1. Which method (A or B) is the best? Explain why.

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The following time series shows the sales of supermarket chain over the last six months. 

Month

Sales ($ 000)

August 2021

250

Sep 2021

280

Oct 2021

295

Nov 2021

320

Dec 2021

380

Jan 2022

360

 

  1. Develop a linear trend equation that can be used to forecast sales in Feb 2022.
  2. Forecast the sales in Feb 2021 using a three-period weighted moving average designed with the following weights: Nov 2021 weight 0.6, Dec 2021 weight 0.3 and Jan 2022 weight 0.1. Which method (A or B) is the best? Explain why.  
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