The Following Data Represent a Company's Yearly Sales Volume and Its

The following data represent a company's yearly sales volume and its advertising expenditure over a period of 8 years.
a. Develop a scatter diagram of sales versus advertising and explain what it shows regarding the relationship between sales and advertising.
b. Use the method of least squares to compute an estimated regression line between sales and advertising.
c. If the company's advertising expenditure is $400,000, what are the predicted sales? Give the answer in dollars.
d. What does the slope of the estimated regression line indicate?
e. Compute the coefficient of determination and fully interpret its meaning.
f. Use the F test to determine whether or not the regression model is significant at $\alpha$ = 0.05.

Correct Answer:

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a. The scatter diagram shows a positive...

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