Question

Use a calculator to verify that Σx = 153.0, Σx2 = 3424.78, Σy = 243, Σy2...

Use a calculator to verify that Σx = 153.0, Σx2 = 3424.78, Σy = 243, Σy2 = 9785 and Σxy = 5524.6. Compute r. (Round to 3 decimal places.)


x		 10.9 31.8 24.5 14.3 7.5 27.7 16.2 20.1
y 24 72 39 23 15 30 15 25
Math   Statistics-And-Probability   
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Answer #1

Solution:

X Y XY X2 Y2
10.9 24 261.6 118.81 576
31.8 72 2289.6 1011.24 5184
24.5 39 955.5 600.25 1521
14.3 23 328.9 204.49 529
7.5 15 112.5 56.25 225
27.7 30 831 767.29 900
16.2 15 243 262.44 225
20.1 25 502.5 404.01 625
SUM 153.0 243 5524.6 3424.78 9785

r = 0.801

Answer : r = 0.801

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