Reverse the slope of the line in Exercise 12.51 by reordering the y observations, as follows:

Repeat the steps of Exercise 12.51. Notice the change in the sign of r and the relationship between the values of r2 of Exercise 12.51 and this exercise.
In Exercise 12.51
You are given these data:

a. Plot the six points on graph paper.
b. Calculate the sample coefficient of correlation r and interpret.
c. By what percentage was the sum of squares of deviations reduced by using the least squares predictor Å· = a + bx rather than as a predictor of y?

Transcribed Image Text:

y0 2 3 5 5 7 1 2 3 4 5 6