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For two variables, which of the following is equal to the average product of the deviations from their respective means?
Correct Answer: D
Covariance is a measure of the degree to which two variables move together. It is calculated as the average product of the deviations of each pair of observations from their respective means. If the covariance is positive, the variables tend to move in the same direction. If it is negative, they move in opposite directions.