Reference no: EM131787446
Question - Anna Martinez, the financial manager at the Casa Real restaurant, is checking to see if there is any relationship between newspaper advertising and sales revenues at the restaurant. She obtains the following data for the past 10 months:
Month Revenue Advertising Cost
March $50,000 $2,000
April $70,000 $3,000
May $55,000 $1,500
June $65,000 $3,500
July $55,000 $1,000
August $65,000 $2,000
September $45,000 $1,500
October $80,000 $4,000
November $55,000 $2,500
December $60,000 $2,500
She estimates the following regression equation:
Monthly revenues = $39,502 + ($8,723 x advertising costs)
1. Plot the relationship between advertising costs and revenues
2. Draw the regression line and evaluate it using the criteria of economic plausibility, goodness of fit, and slope of the regression line.
3. Use the high-low method to compute the function, relating advertising costs and revenues.
4. Using (a) the regression equation and (b) the high-low equation, what is the increase in revenues for each $1,000 spent on advertising within the relevant range? Which method should Martinez use to predict the effect of advertising on revenues? Explain briefly.
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