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How is the sample correlation coefficient calculated between two variables X and Y? A O By subtracting the sample covariance from the product of the sample standard deviation of X and the sample standard deviation of Y B O By multiplying the sample covariance by the product of the sample standard deviation of X and the sample standard deviation of Y C O By adding the sample covariance to the product of the sample standard deviation of X and the sample standard deviation of Y D O By dividing the sample covariance by the product of the sample standard deviation of X and the sample standard deviation of Y