Regression, Basic Statistics

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Sales from a leading motor dealership were monitored over the past four years. The sales figures are presented in the accompanying table.
Year
Quarter 1
Quarter 2
Quarter 3
Quarter 4
1
20
30
39
60
2
40
51
62
81
3
50
64
74
95
4
55
68
77
96
Using the ratio-to-moving average method and linear regression analysis, obtain seasonally-adjusted trend estimates of the quarterly sales for year 5. Show the relevant details of your calculations.

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