15. A phone manufacturer wishes to estimate the proportion of people who want to purchase a...

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15. A phone manufacturer wishes to estimate the proportion of people who want to purchase a cell phone which costs more than $800. Find the required sample size to yield a 90% confidence interval whose length is below 0.02

math Statistics-And-Probability

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Answer Date: 13/11/2018 The sample si From the standard normal table, the z-critical value at 90% confidence is 1 .64 5. The information represent E = 0.02, p = 0.50 andる= 1 .645 for finding sample size. ze 1s, -| × 0.50(1-0.50) (002) × 0.50(1-0.50) 1691 .27 ~ 1692 The sample size is 1692

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