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Chapter 11: Q.11.1 (page 459)
In a newspaper or magazine of your choice, find a statistical study that contains an estimated population proportion.
The article was published in the January edition:
According to a research, in the yearpercent of workers are members of unions.
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Obtain a sample size that will ensure a margin of error of at most the one specified.
Margin of error
Confidence level
For what is the phrase "number of failures" an abbreviation?
1Neutropenia. Neutropenia is an abnormally low number o neutrophils (a type of white blood cell) in the blood. Chemotherapy often reduces the number of neutrophils to a level that makes the patient susceptible to fever and infections. G. Bucaneve et al. published a study of such cancer patients in the paper "Levofloxacin to Prevent Bacterial Infection in Patients With Cancer and Neutropenia" (New England Journal of Medicine, Vol. 353, No, 10, pp. 977-987). For the study. 375 patients were randomly assigned to receive a daily dose of levofloxacin, and 363 were given a placebo. In the group receiving levofloxacin, fever was present in 243 patients for the duration of neutropenia, whereas fever was experienced by 308 patients in the placebo group.
a. At the1% significance level, do the data provide sufficient evidence to conclude that levofloxacin is effective in reducing the occurrence of fever in such patients?
b. Find a98% confidence level for the difference in the proportions of such cancer patients who would experience fever for the duration of neutropenia
Smallpox Vaccine. ABCNEWS.com published the results of a poll that asked U.S. adults whether they would get a smallpox shot if it were available. Sampling, data collection, and tabulation were done by TNS Intersearch of Horsham, Pennsylvania. When the risk of the vaccine was described in detail, in of those surveyed said they would take the smallpox shot. According to the article, "the results have a three-point margin of error" (for a confidence level). Use the information provided to obtain a confidence interval for the percentage of all U.S. adults who would take a smallpox shot, knowing the risk of the vaccine.
A poll by Gallup asked, "If you won million dollars in the lottery, would you continue to work or stop working?' Of the American adults surveyed, said that they would continue working. Obtain a confidence interval for the proportion of all American adults who would continue working if they won 10 million dollars in the lottery.
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