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A simple random sample of 50 items from a population with o = 8 resulted in a sample mean of 38

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A simple random sample of 50 items from a population with o = 8 resulted in a sample mean of 38. (Round your answers to two decimal places.) (a) Provide a 90% confidence interval for the population mean. to (b) Provide a 95% confidence interval for the population mean to (c) Provide a 99% confidence interval for the population mean.