European Union (EU) countries report that 46% of their labor force isfemale. The United Nations wants to determine if the percentage offemales in the US labor force is the same. Representatives from the USDepartment of Labor selected a random sample of 525 from over 10,000records on file and found that 229 are female. The 95% confidence interval for the proportion of females in the US labor force is
a. 0.35 to 0.47
b. 0.40 to 0.48
c. 0.17 to 0.69