4. suppose the covariance between y and x is 12, the variance of y is 25, and the variance of x is 36. what is the correlation coefficient (r), between y and x? a. 0.400. b. 0.013. c. 0.000. d. 0.160.
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Correlation coefficient r=covariance /(s. d of x) (s. d ofy) =12/5*6=0.4
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