SOLUTION: 9. The paired data below consist of the test scores of 6 randomly selected students and the number of hours they studied for a test. Find the value of the linear correlation coeff

Algebra ->  Average -> SOLUTION: 9. The paired data below consist of the test scores of 6 randomly selected students and the number of hours they studied for a test. Find the value of the linear correlation coeff      Log On


   

Question 114506: 9. The paired data below consist of the test scores of 6 randomly selected students and the number of hours they studied for a test. Find the value of the linear correlation coefficient, r.
Hours studied 5 10 4 6 10 9
Test score 64 86 69 86 59 87
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
Using the TI-83 LinReg function I get r = 0.2242..
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If you want to do it by hand:
Find the mean of the x values = x-bar
Find the mean of the y values =y-bar
Find the std dev of the x values = sx
Find the std dev of the y values = sy
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Find the sum of the products [(x - x-bar)(y - y-bar)]/sxsy
for each x/y pair.
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Cheers,
Stan H.