You may need to use the appropriate appendix table or technology to answer this question. A simple random sample of 60 items from a population with a 8 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 (b) Provides 95% confidence interval for the population mean. to (c) Provide a 99% confidence interval for the population mean. to