You may need to use the appropriate appendix table or technology to answer this question. A simple random sample of 80 items resulted in a sample mean of 60. The population standard deviation is = 10. (a) Compute the 95% confidence interval for the population mean. (Round your answers to two decimal places.) X to (b) Assume that the same sample mean was obtained from a sample of 160 items. Provide a 95% confidence interval for the population mean. (Round your answers to two decimal places.) X to Enter a number. (c) What is the effect of a larger sample size on the interval estimate?