A simple random sample of 20 items resulted in a sample mean of 20. The population standard deviation is 0' = 15. a. Compute the 95% condence interval for the population mean. Round your answers to one decimal place. ( I ) b. Assume that the same sample mean was obtained from a sample of 110 items. Provide a 95% confidence interval for the population mean. Round your answers to two decimal places. ( I ) c. What is the effect of a larger sample size on the interval estimate? Larger sample provides a Select your answer v margin of error