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(iv) When A and B are not statistically independent, is the value of (6A EB) necessarily positive? How would you interpret a negative value in

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(iv) When A and B are not statistically independent, is the value of (6A EB) necessarily positive? How would you interpret a negative value in terms of the relationship between uctuations in A and in B? (v) Write (6A4) in terms of the moments (A), (A2), (A3), and (A4)

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