Hint(s) Check My Work simple random sample of 20 items resulted in a sample mean of 20. The population standard deviation is o = 15. . 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 130 items. Provide a 95% confidence interval fo 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 smaller margin of error. Hide Feedback Partially Correct Work