18. EU (European Union) countries report that 46% of their labor force is female

Question

18. 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

Explanation / Answer

Increasing the confidence level would yield larger margin of error, so not A.

Increasing the sample size decreases the margin of error, so it is C (not B).

Hence,

OPTION C: Increase the sample size [ANSWER]

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