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3. Suppose that survival time X has a lognormal distribution with parameters and (which are the mean and standard deviation of In(X), not of

3. Suppose that survival time X has a lognormal distribution with parameters and (which are the mean and standard deviation of In(X), not of X itself). Are X; and x jointly sufficient for the two parameters? If not, what is a pair of jointly sufficient statistics? Prove that your sufficient statistics are indeed sufficient.

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