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Unformatted text preview: non-normal. 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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This note was uploaded on 06/05/2011 for the course STATISTICS 2006 taught by Professor Ho during the Spring '11 term at CUHK.
- Spring '11