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An advertising firm plans to have a sample of individuals view a commercial on a sunscreen pill that one can swallow to provide a mild

An advertising firm plans to have a sample of individuals view a commercial on a "sunscreen pill" that one can swallow to provide a mild SPF protection throughout the day. After viewing the commercial , each individual will be asked if he/she would consider buying the product. How many individuals should the firm sample to estimate the proportion who would consider buying the product to within 4% margin of error and 98% confidence?

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