The United Nations wants to find out the percentage of females in the U.S. labor force.
1) The Department of Labor wants to estimate the percentage of females in the U.S. labor force to within 5%, with 90% confidence. How many employment records should be sampled?
2) They actually select a random sample of 500 employment records, and find that 240 of the people are females. Construct the 90% confidence interval.
3) Are the assumptions and conditions for constructing a confidence interval met? Explain.