In Developing an Interval Estimate for a Population Mean,a Sample $\pm$

Multiple Choice

In developing an interval estimate for a population mean,a sample of 50 observations was used.The interval estimate was 19.76 $\pm$ 1.32.Had the sample size been 200 instead of 50,the interval estimate would have been:

A) 19.76 $\pm$ .33
B) 19.76 $\pm$ .66
C) 19.76 $\pm$ 5.28
D) None of these choices.