In Developing a Confidence Interval for the Population Mean $\mu$ , a Sample of 50 Observations Was Used, and the

Multiple Choice

In developing a confidence interval for the population mean $\mu$ , a sample of 50 observations was used, and the confidence interval was 15.24 $\pm$ 1.20. Had the sample size been 200 instead of 50, the confidence interval would have been

A) 7.62 $\pm$
1) 20
B) 15.24 $\pm$
) 30
C) 15.24 $\pm$
) 60
D) 3.81 $\pm$
1) 20
E) None of the above answers are correct.