Use the Following Information for Questions

Short Answer

Use the following information for questions:
According to a survey conducted by the Association for Dressings and Sauces (this is an actual association!), 85% of American adults eat salad at least once a week, so that 15% of American adults eat no salad at all! A nutritionist suspects that the percentage (of no-salad eaters) is wrong. She conducts a survey among a sample of adults in her area to test this idea.
-What sample size would be needed to provide a margin of error no larger than 2%?