Concept explainers
The graph in Exercise 63 shows the average height of girls based on their age. The data in the table give the average height y (in inches) for girls of age x (in yr).
a. Use the data in the table to find the least-squares regression line. Round the slope to 2 decimal places and the y-intercept to 1 decimal place.
b. Use a graphing utility to graph the regression line and the observed data.
c. Use the model in part (a) to approximate the average height of 11-yr-old girls.
d. If the height of a girl at age 11 is
e. By how much do the results of part (d) differ from the result of Exercise 63(d)?

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