Other things being equal, the margin of error of a confidence interval increases as the a. sample size increases. b. sample mean increases. confidence level increases. C. d. confidence level...

Extracted text: Other things being equal, the margin of error of a confidence interval increases as the a. sample size increases. b. sample mean increases. confidence level increases. C. d. confidence level decreases. none of the above. е. An SRS of 100 postal employees found that the average time these employees had worked for the postal service was x 7 years with standard deviation s 2 years. Assume the distributi on of the time the population of employees have worked for the postal service is approximately Normal. Which of the following gives the correct 95% confidence interval for the mean time u the population of postal service employees have worked for the postal service? 7 2 %3D a. b. 7 1.984 7 0.525 C. d. 7 0.4 7 0.2 e.