Question: For the data in Exercise 15, verify that a least squares regression line using only X values (age) less than 7 yields b1 = 0.247

For the data in Exercise 15, verify that a least squares regression line using only X values (age) less than 7 yields b1 = 0.247 and b0 = 3.51. Verify that when using only the X values greater than 7 you get b1 = 0.009 and b0 = 4.8. What does this suggest about using a linear rule for all of the data? (The first example in Section 14.2.2 expands on this issue.)

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