Exercises for inferences for a population proportion

# Exercises for inferences for a population proportion - 95...

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Inferences for a population mean using large samples Form the 11 th edition. Sec. 8.5: 79, 81, 83, 85, 89 Sec 7.4: 51, 53, 55, 59, 61 Sec 7.5: Supplementary exercises From the 10 th edition Sec. 8.5: 77, 79, 81, 83, 87 Sec 7.4: 49, 51, 53, 55, 59 Sec 7.5: Supplementary exercises Supplementary exercises for large-sample confidence interval for p (Sec 7.5) 1. A Reader’s Digest/Gallop Survey on the drinking habits of Americans estimated the percentage of adults across the country who drink beer, wine or hard liquor, at least occasionally. Of the 1516 adults interviewed, 985 said that they drank. (a) Determine a 95% confidence interval for the proportion of all Americans who drink beer, wine or hard liquor, at least occasionally. (0.626, 0.674) (b) Interpret your result from part (a). (c) Obtain a sample size that will ensure a margin of error of at most 0.02 for a 95% confidence interval without making a guess for the observed value of the sample proportion. (2401) (d) Obtain a sample size that will ensure a margin of error of at most 0.02 for a
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Unformatted text preview: 95% confidence interval if you can reasonable presume that the percentage of adults sampled who drink alcoholic beverage will be at least 60%. (2305) 2. The neurologists from The University of Malaysia found that, among 94 patients infected with the Nipah virus, 30 died from encephalitis. (a) Find a 90% confidence interval for the percentage of Malaysians infected with Nipah virus who will die from encephalitis. (0.240058, 0.39824) (b) Obtain a sample size that will ensure a margin of error of at most 5 percentage for a 90% confidence interval without making a guess for the observed value of the sample proportion. (271) (c) Obtain a sample size that will ensure a margin of error of at most 5 percentage for a 90% confidence interval if you can reasonable presume that the percentage of sampled Malaysian infected with Nipah virus who will die from encephalitis will be between 25% and 40%. (260)...
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