8. A simple random sample of size 12 has sample mean of 3.37. The population standard deviation is 1.62. The

population is approximately normally distributed. Construct a 95% confidence interval for the population mean. Include

the calculation for margin of error.

14. In a survey of 1118 U.S. adults conducted by the Financial Industry Regulatory Authority, 629 said they always pay

their credit cards in full each month. Construct a 95% confidence interval for the proportion of U.S. adults who pay their

credit cards in full each month. Include calculation for margin of error