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You may need to use the appropriate appendix table or technology to answer this question. A simple random sample of 50 items from a population with o = 6 resulted in a sample mean of 34. (Round your answers to two decimal places.) (a) Provide a 90% confidence interval for the population mean. to (6) Provide a 95% confidence interval for the population mean. to (c) Provide a 99% confidence interval for the population mean. to