A simple random sample of 60 items resulted in a sample mean of 80. The population standard deviation is o = 15. a. Compute the 95% confidence interval for the population mean. Round your answers to...

Extracted text: A simple random sample of 60 items resulted in a sample mean of 80. The population standard deviation is o = 15. a. Compute the 95% confidence interval for the population mean. Round your answers to one decimal place. b. Assume that the same sample mean was obtained from a sample of 120 items. Provide a 95% confidence interval for the population mean. Round your answers to two decimal places. c. What is the effect of a larger sample size on the interval estimate? Larger sample provides i - Select your answer - margin of error. larger smaller