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12.21 In Problem 12.9 on page 418, an agent for a real estate company wanted to predict the monthly rent for apartments, based on the size of the apartment (stored in the file). Using the results of that problem,,,a. Determine the coefficient of determination, r2, and interpret its meaning.,,b. Determine the standard error of the estimate, and interpret its meaning.,,c. How useful do you think this regression model is for predicting the monthly rent?,,d. Can you think of other variables that might explain the variation in monthly rent?,,