A Research Firm Needs to Estimate Within 3% the Proportion

Multiple Choice

A research firm needs to estimate within 3% the proportion of junior executives leaving large manufacturing companies within three years. A 0.95 degree of confidence is to be used. Several years ago,a study revealed that 21% of junior executives left their company within three years. To update this study,how many junior executives should be surveyed?

A) 594
B) 612
C) 709
D) 897