Which of the following shows the equations of the least squares regression line?
A. L = 7.82t - 9.78
B. L = 7.82t - 17.78
C. L = 0.12t + 2.29
D. L = 0.12t + 1.32
3. Using the same graph presented in the previous question, find the least squares regression line of the data below using the regression feature of a graphing utility. Then, find the average lengths of cellular calls for the year 2013.
A. 242.88 minutes
B. 4.08 minutes
C. 3.48 minutes
D. 3.97 minutes
4. Using the same graph again, find the least squares regression line of the data below using the regression feature of a graphing utility. Then, find the correlation coefficient for the regression line. Round to four decimal places.
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