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need help with this problem: The linear trend forecasting equation for an annual time series containing 40 values (from 1967 to 2006) on net sales

need help with this problem:

The linear trend forecasting equation for an annual time series containing 40 values (from 1967 to 2006)

on net sales (in billions of dollars) is shown below.

Yi= 3.5 + 1.3xi

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