A company has recorded expenditure on advertising and the resulting sales for six months are as follows: Month  Expenditure  Sales(Y) March  20 170 April 40 240 May 50 260 June 60 300 July 30 220 August 40 250 Required: i. Plot the data on a scatter diagram and comment ii. Calculate the line of best fit through the data, and interpret your values of  α and β iii. Determine the explanatory power of your system iv. Forecast sales when advertising expenditure is: 500 and 100 respectively

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