Consider the data in Table P-3 where X = weekly advertising expenditures and Y = weekly sales.
a. Does a significant relationship exist between advertising expenditures and sales?
b. State the prediction equation.
c. Forecast sales for an advertising expenditure of $50.
d. What percentage of the variation in sales can be explained with the prediction equation?
e. State the amount of unexplained variation.
f. State the amount of total variation. |

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