The percentages of teens who have cell phones are shown in Table 38 for various ages.

Let p be the percentage of teens at age a years who have cell phones.
a. Construct a scatterplot.
b. Find the linear regression equation.
c. The equation of the line that contains the data points (13, 54) and (17, 79) is = 6.25x - 27.25. Graph the equation and the regression equation on the same scatterplot. Describe how well each line fits the data points.
d. Find the sum of squared residuals for the linear model = 6.25x - 27.25.
e. Find the sum of squared residuals for the regression line.
f. Compare the results you found in parts (d) and (e) and explain why your comparison is not surprising.

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Table 38 Percentages of Teens Who Have Cell Phones Age years) 13 14 15 16 17 Percent 54 68 68 73 79