Friday
December 19, 2014

Homework Help: Math

Posted by DeeDee on Wednesday, May 29, 2013 at 10:52pm.

Does studying for an exam pay off? The number of hours studied, x, is compared with the exam grade received, y.

x 7 7 5 5 7
y 95 90 75 85 95

(a) Complete the preliminary calculations: SS(x), SS(y), and SS(xy).
Incorrect: Your answer is incorrect. . (SS(x)) (my answer was 100.9)
Incorrect: Your answer is incorrect. . (SS(y)) (my answer was 720)
Incorrect: Your answer is incorrect. . (SS(xy)) (My answer was 1396)
I have got several answers and none of them have been correct.
(b) Find r. (Give your answer correct to three decimal places.) (my answer was 7.04) and it was wrong, could some one work this out so I can see how I missed it.
Incorrect: Your answer is incorrect. .

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