Eight pairs of data yield r = 0.708 and the regression equation ^ y= 55.8 + 2.79

Question

Eight pairs of data yield r = 0.708 and the regression equation ^                                                                                           y= 55.8 + 2.79x. also _       y = 71.125. What is the best predicted value of y for x = 6.8 ?

          a. 71.13

b. 74.77

c. 57.80

d. 382.23
                                                                                  Eight pairs of data yield r = 0.708 and the regression equation ^                                                                                           y= 55.8 + 2.79x. also _       y = 71.125. What is the best predicted value of y for x = 6.8 ?

          a. 71.13

b. 74.77

c. 57.80

d. 382.23
                                                                                 

Explanation / Answer

Y = 55.8 + 2.79x. for x = 6.8, y = 55.8 +(2.79*6.8) = 74.77 hence the correct answeris b. 74.77

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