For many years, TV executives used the guideline that 30% of the audience were watching each of the traditional big three prime-time networks and 10% were watching cable stations on a weekday night. A random sample of 500 viewers in the Tampa–St. Petersburg, Florida, area last Monday night showed that 165 homes were tuned in to the ABC affiliate, 140 to the CBS affiliate, and 125 to the NBC affiliate, with the remainder viewing a cable station. At the .05 significance level, can we conclude that the guideline is still reasonable?
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