Data collected on the monthly demand for a certain product in thousands of dollars are shown in the following table. (Attached)  a) Using a weighted moving average with three periods, determine the demand for period 13. Use 3, 2, and 1 for the weights of the most recent, second most recent, and third most recent periods, respectively  b) Find the MAD, MSE and MAPE

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Data collected on the monthly demand for a certain product in thousands of dollars are shown in the following table. (Attached) 

a) Using a weighted moving average with three periods, determine the demand for period 13. Use 3, 2, and 1 for the weights of the most recent, second most recent, and third most recent periods, respectively 


b) Find the MAD, MSE and MAPE


b) Use exponential smoothing with a smoothing constant of 0.30 to forecast the sales.
Assume that last period’s forecast for month 1 is equal to actual to begin the procedure. Which method do you think is best? Is this an improvement over the weighted average- use MAD only 


c) Use regression analysis to estimate the line of best fit -use the manual method with theformulas shown below.

y= a+ bx
where:
nE xy – Ex£y
b
NEX² – (Ex)²
a = ỹ – bx
Transcribed Image Text:y= a+ bx where: nE xy – Ex£y b NEX² – (Ex)² a = ỹ – bx
Month
Demand
1
145.5
2
160
3
71
4
99
5
194.5
6.
206
7
135.5
8
152.5
9
246
10
259
11
181.5
12
194
Transcribed Image Text:Month Demand 1 145.5 2 160 3 71 4 99 5 194.5 6. 206 7 135.5 8 152.5 9 246 10 259 11 181.5 12 194
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