Advertising companies often try to characterize the average user of a client's product so ads can be targeted at particular segments of the buying community. A new movie is about to be released, and the advertising company wants to determine whether to aim the ad campaign at people under or over 25 years of age. It plans to arrange an advance showing the movie to an audience from each group and then obtain opinion about the movie from each individual. H many individuals should be included in each sample if I advertising company wants to estimate the difference the proportions of viewers in each age group who will fill the movie to within .05 with 90% confidence? Assume I sample size for each group will be the same and about I of each group will like the movie.