The correct answer was A) The covariance is in terms of the product of the units of Y and X. It is defined as the average value of the product of the deviations of observations of two variables from their means. The correlation coefficient is a standardized version of the covariance, ranges from –1 to +1, and is much easier to interpret than the covariance. | 
发表于 2008-4-1 12:24
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