If - X - X Y - Y -90- - X - X 2-144- - Y - Y 2-250 and N -50- what is Karl Pearson-s correlation coefficient-

R= ∑ (X X) (Y Y)/√(∑ (X X)^2)√(∑ (Y Y)^2) = 90/√(144)√(250) = 90/189.73= 0.474 ...

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Step Deviation Method to Calculate R

If ∑ X - X Y ...

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If $\sum (X - ¯ ¯¯¯ ¯ X) (Y - ¯ ¯¯ ¯ Y)$ = 90, $\sum (X - ¯ ¯¯¯ ¯ X)^{2}$ = 144, $\sum (Y - ¯ ¯¯ ¯ Y)^{2}$ = 250 and N= 50, what is Karl Pearson's correlation coefficient?

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Find Karl Pearson's correlation coefficient if N = 50, $\sum X = 75, \sum Y = 80, \sum X^{2} = 130, \sum Y^{2} = 140$ and $\sum X Y = 128$ .

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