12.55 You are given these data:

a. Plot the six points on graph paper.

b. Calculate the sample coefficient of correlation and interpret.

c. By what percentage was the sum of squares of deviations reduced by using the least-squares pre- dictor = a + bx rather than as a predictor of y?

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x y 1 2 3 4 5 6 7 5 5 3 20