A simple random sample of 10 items resulted in a sample mean of 20. The population standard deviation is 0' = 15. a. Compute the 95% confidence Interval for the population mean. Round your answers to one decimal place. (I I . I I ) b. Assume that the same sample mean was obtained from a sample of 130 items. Provide a 95% condence interval for the population mean. Round your answers to two decimal places. (I I . I I ) I:. What is the effect of a larger sample size on the interval estimate? Larger sample provides a Select your answu- V margin of error