EU (European Union) countries report that 46% of their labor force is female.The United Nations wants to determine if the percentage of females in the U.S.labor force is the same.Based on a sample of 500 employment records, representatives from the United States Department of Labor find that the 95% confidence interval for the proportion of females in the U.S.labor force is .357 to .443.If the Department of Labor wishes to tighten its interval, they should ________________________ .
A)increase the confidence level.
B)decrease the sample size.
C)increase the sample size.
D)Both A and B
E)Both A and C

Question

Quizplus · Accepted Answer

Increasing the sample size reduces the margin of error, leading to a tighter confidence interval without changing the confidence level.

EU (European Union) Countries Report That 46% of Their Labor