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Pretend that the sample standard deviation is the population standard deviation A random sample of 90 observations produced a mean x = 25.4 and a

Pretend that the sample standard deviation is the population standard deviation

A random sample of 90 observations produced a mean x = 25.4 and a standard deviation s = 2.4. a. Find a 95% confidence interval for u. b. Find a 90% confidence interval for u. c. Find a 99% confidence interval for u

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