In developing an interval estimate for a population mean, a sample of 40 observations was used. The interval estimate was 28.76 1.48. Had the sample size been 160 instead of 40, the interval estimate would have been ____.
A)	28.76 0.37
B)	28.76 0.74
C)	28.76 1.48
D)	28.76 2.96
Answer:B
In developing an interval estimate for a population mean, a sample of 40 observations was used. The interval estimate was 28.76 1.48. Had the sample size been 160 instead of 40, the interval estimate would have been ____.
A)	28.76 0.37 B)	28.76 0.74 C)	28.76 1.48 D)	28.76 2.96