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Activity: Forecasting - Simple Linear Regression Model The sales for a silicon chips firm based in Chicago over the last 10 weeks are shown in the table below. Plot the data, and visually check to see if a linear trend line would be appropriate. Then determine the equation of the trend line, and predict sales for weeks 11 and 12. Week 1 2 3 4 5 Unit Sales 700 724 720 728 7 8 9 10 740 742 758 750 770 775 Solution: X-week x? y-unit sales xy Sum= Average= Sum= Average= 11 12 b= a= Regression Model