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Assume a binomial model for a certain random variable

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Assume a binomial model for a certain random variable. If we desire a 90% confidence interval for p that is at most 0.02 in length, find n. 2. It is known that a random variable X has a Poisson distribution with parameter μ. A sample of 200 observations from this distribution has a mean equal to 3.4. Construct an approximate 90% confidence interval for μ.