Part A Ingenuity Limited, a large consumer goods company has been analyzing the effect of advertising on total profits. The table below contains the data collected over a six-month period. Advertising Expenditure (in $1,000) (X): 10, 15, 7, 12, 14, 9 Total Sales (in $1,000) (Y): 100, 200, 80 120, 150, 90 a) Calculate the mean of Advertising Expenditure and Total Sales. b) Calculate the variance of the Advertising Expenditure. c)Calculate the covariance of Advertising Expenditure and Total Sales. d) Calculate and interpret b1, the slope of the regression line. e) Calculate b0