High-low method, regression analysis. Anna Martinez, financial manager at the Casa Real restaurant is checking to see if there is any relationship between newspaper sales and advertising revenues at the restaurant She obtains the subsequent data for the past 10 months: She estimates the subsequent regression equation: Monthly revenues = $39,502 + ($8.723) × Advertising costs) . Use the high-low method to calculate the function, relating advertising costs and revenues. . Using
(a) the regression equation and
(b) the high-low equation, find the increase in revenues for each $1,000 spent on advertising within the relevant range?
Which method should Martinez use to predict effect of advertising costs on revenues? describe briefly