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Suppose, for this term, Edward decided to create 3 different versions of the final exam for COMM5005. After the exam, he wants to compare the

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Suppose, for this term, Edward decided to create 3 different versions of the final exam for COMM5005. After the exam, he wants to compare the variability of student performance among the three versions. Which of the following is the most appropriate measure that Edward should use? Select one: O a. Mode O b. Coefficient of correlation O c. Covariance O d. Coefficient of variation

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