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An analyst wants to use the ratio-to-moving-average method to forecast a company's sales for the next few months.

An analyst wants to use the ratio-to-moving-average method to forecast a company's sales for the next few months. Beginning in April of , the analyst collects the following sales data (in millions of dollars).

Estimate the seasonal index associated with December. Round your answer to at least three decimal places.

Time Period Quarter Sales Moving Average
1 3 113.5

2 4 154.1
123.175
3 1 126.3
118.175
4 2 98.8
133
5 3 93.5
134.95
6 4 213.4
139.45
7 1 134.1
146.225
8 2 116.8
143.425
9 3 120.6
149.925
10 4 202.2
155.675
11 1 160.1

12 2 139.8


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