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Two sets of observations, A and B, each contain 160 observations. The variance of data in A equals 198.4 and that of the data in B equals 231.9. The two sets have the same mean. Then, A has a ______ dispersion and a ______ coefficient of variation.
Correct Answer: B
The coefficient of variation equals the standard deviation divided by the mean. Since A and B have the same mean, B has a higher coefficient of variation.