Unformatted text preview: nonnormal. How large a sample should the research worker select ? 3 Proportion Case Example 3: A cable television company would like to estimate the proportion of its customers who would purchase a fancy cable television guide. The company would like to have a 95% conﬁdence that its estimate is correct within ± . 05 from the true proportion. 1. What sample size is needed ? 2. Given the past experience in other areas indicates that roughly 30% of the customers will purchase the program guide, what sample size is needed ? 3. Given the past experience in other areas indicates that less than 20% of the customers will purchase the program guide, what sample size is needed ? 1...
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 Spring '11
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 Statistics, Standard Deviation

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