In the next two exercises, use correlation coefficients to determine which of the gi...

In the next two exercises, use correlation coefficients to determine which of the given sets of data is best fit by its associated regression line and which is fit worst. Is it a perfect fit for any of the data sets? HINT [See Example 3.]

a. {(1, 3), (-2, 9), (2, 1)}

b. {(0, 1), (1, 0), (2, 1)}

c. {(0, 0), (5, -5), (2, -2.1)}

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