5.Which of the following statements about covariance and correlation is least accurate? A) A zero covariance implies a zero correlation. B) A positive covariance is indicated by an upward sloping relation in the points on the scatter plot of the two variables. C) The covariance and correlation are always the same sign, positive or negative. D) There is no relation between the sign of the covariance and the correlation.
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发表于 2008-4-1 12:23
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