1. An economist reported that the correlation between the monthly income ($) of a family of 4 and the monthly food expenditure ($) for middle class families is 0.81. Which of the statements below correctly interprets the correlation coefficient?

A. Monthly income and monthly food expenditure have a strong positive correlation. As monthly incomes increase, food expenditures are also increasing.

B. Monthly income and monthly food expenditure have a no correlation. As monthly incomes increase, food expenditures stay the same.

C. Monthly income and monthly food expenditure have a strong negative correlation. As monthly incomes increase, food expenditures are decreasing.

D. Monthly income and monthly food expenditure have a strong positive correlation. As monthly incomes increase, food expenditures are decreasing.

2. On the first statistics exam, the correlation between the number hours studied and the grade earned was 0.8. What percent of the variation in the grade earned can be explained by the number of hours studied?

A. 40%

B. 64%

C. 89%

D. 1.6%

3. The following linear regresion equation represents 18 brown trout caught in a local river. The fish were measured (inches) and weighed (ounces) before they were released back into the river.

Weight^=-2.28+1.20Length

Use the equation to predict the weight of a brown trout that is 13 inches in length.Do not round.