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On the problem of forecasting by trend extrapolation method
The least square method is used to find the trend equation, and then the trend equation is used to predict.

According to the scatter chart, the sales trend type belongs to linear y=a+bt. If the time from July 2005 to June 2005 12 is 1, 2, 3, 4, 5, 6, then a= 137.27 and b=5.83 can be obtained according to the formula.

The method of forecasting the sales in the first month of 2006 is to substitute t=7 into the trend equation.

The predicted value is:137.27+5.83 * 7 =178.07.