The manager of a supermarket is interested in the possible relationship that might exist between the monthly volume of sales and the amount (in rand) paid on advertising. The information below is for the past 6 months: Amount paid on the advertising (x) Monthly volume sales (y) 09.2 110 125 11.5 120 10.2 190 20.6 130 17.8 200 23.6 1.1 Plot a scatter diagram displaying the relationship between the monthly volume of sales and the amount paid on advertising and fit the line. 1.2 Calculate the regression line equation in the form ŷ = a + bx. Estimate the monthly volume of sales for the amount, R180 paid on advertising. 1.3

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