A discussion of digital ethics appears in the article "Academic Cheating, Aided by Cell Phones or Web, Shown to be Common" (Los Angeles Times, June 17, 2009). One question posed in the article is: What proportion of college students have used cell phones to cheat on an exam? Suppose you have been asked to estimate this proportion for students enrolled at a large university. How many students should you include in your sample if you want to estimate this proportion to within .02 with 95% confidence?