Have you had a business presentation disturbed by a ringing cell phone? In a poll of 326 business men and women, 303 answered this question "yes" and only 23 answered "no" ("You Say," Presentations: Technology and Techniques for Effective Communication, January 2003, 18). Round p-bar to 4 decimal places! To conduct a follow-up study that would provide 99% confidence that the point estimate is correct to within 0.02 of the population proportion, how large a sample size is required? 0269 O 1088 444 O 1692 631