Television viewers often express doubts regarding the validity of certain commercials. In an attempt to answer their critics, a large advertiser desires to determine the true proportion of consumers who thinks what is shown in commercials. Preliminary studies indicte that about 30% of those surveyed believe what is shown in commercials. What is the minimum number of consumers that should be sampled by the advertiser to be 95% confident that their estimate will fall within 3% of the true population proportion?