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 = 8 resulted in a sample mean of 36. (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. to