Consider the following table showing the average hours of television watched in households in five categories of annual income.

a. Construct a scatterplot for the data. To locate the dots, use the midpoint of each income category. Use a value of $25,000 for the category "less than $30,000," and use $70,000 for "more than $60,000."
b. Briefly characterize the correlation in words and estimate the correlation coefficient.
c. Suggest a reason why families with higher incomes watch less TV. Do you think these data imply that you can increase your income simply by watching less TV? Explain.

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Household income Less than $30,000 $30,000-$40,000 $40,000-$50,000 $50,000-$60,000 More than $60,000 Weekly TV hours 56.3 51.0 50.5 49.7 48.7