The data points given in Exercises 6 were formed by reversing the slope of the lines in Exercises 4. Plot the points on graph paper and calculate r and r2. Notice the change in the sign of r and the relationship between the values of r2 compared to Exercises 4.

By what percentage was the sum of squares of deviations reduced by using the least-squares predictor yˆ5a1bx rather than y as a predictor of y?

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6. x -2 -1 0 1 2 y 4 4 3 2 2