Show transcribed image text A simple random sample of 30 items resulted in a sample mean of 20. The population standard deviation is Ïƒ 15. a. Compute the 95% confidence interval for the population mean. Round your answers to one decimal place Enter your answer using parentheses and a comma, in the form (n1,n2). Do not use commas in your numeical answer (i.e use 1200 instead of 1,200, etc.) b. Assume that the same sample mean was obtained from a sample of 100 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 l -Select your answer-margin of error.

A simple random sample of 30 items resulted in a sample mean of 20. The population standard deviation is Ïƒ 15. a. Compute the 95% confidence interval for the population mean. Round your answers to one decimal place Enter your answer using parentheses and a comma, in the form (n1,n2). Do not use commas in your numeical answer (i.e use 1200 instead of 1,200, etc.) b. Assume that the same sample mean was obtained from a sample of 100 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 l -Select your answer-margin of error.