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7. A random sample of size 35 is drawn from normal population whose population standard deviation is known to be 5.3. The sample mean is

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7. A random sample of size 35 is drawn from normal population whose population standard deviation is known to be 5.3. The sample mean is 34.2 Compute the 95% confidence interval for u, true value of mean? 7a. What is the smallest sample size required to provide a 99% confidence interval for a mean, if it important that the interval be no longer than 1 unit

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