Hint(s) Check My Work A simple random sample of 10 items resulted in a sample mean of 30. The population standard deviation is o = 20. a. Compute the 95% confidence interval for the population mean. Round your answers to one decimal place. 3 X 17.2 b. Assume that the same sample mean was obtained from a sample of 90 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 a - Select your answer - margin of error. Hide Feedback X Incorrect