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Assume that a random sample of size n = 35 has been drawn from a population with = 30 and a sample mean of x

Assume that a random sample of size n = 35 has been drawn from a population with = 30 and a sample mean of x = 200. (i) What is the 99% confidence interval estimate of ? (ii) If a 95% confidence interval is [226, 230] for a population with = 12, what is n?

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