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Let X1, X2,...Xn be n random samples of the normal distribution N(u,4), where u is unkonwn. Write down the 99% confidence interval of u in

Let X1, X2,...Xn be n random samples of the normal distribution N(u,4), where u is unkonwn. Write down the 99% confidence interval of u in terms of n. What sample size n is required such that the width of this confidence interval is less than 0.7?

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