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Chapter 11: Q. 11.32 (page 460)
Obtain a sample size that will ensure a margin of error of at most the one specified.
Margin of error
Confidence level
The required sample size is
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Life Support. In , the Terri Schiavo case focused national attention on the issue of withdrawal of life support from terminally ill patients or those in a vegetative state. A Harris Poll of U.S. adults was conducted by telephone on April , Of those surveyed, had experienced the death of at least one family member or close friend within the last years who died after the removal of life support. Find and interpret a confidence interval for the proportion of all U.S. adults who had experienced the death of at least one family member or close friend within the last years after life support had been withdrawn.
Folic Acid and Birth Defects. Refer to Exercise 11.107 and determine and interpret a confidence interval for the difference between the rates of major birth defects for babies born to women who have taken folic acid and those born to women who have not.
In a New York Times article "More Mother Breast-Feed, in First Months at Least," G. Harris reported that new mothers breast-feed their infants at least briefly, the highest rate seen in the United States in more than a decade. His report was based on data for infants from the National Health and Nutrition Examination Survey, which involved in-person interviews and physical examinations. Find a confidence interval for the percentage of all new mothers who breast-feed their infants at least briefly.
Asthmatics and Sulfites. In the article "Explaining au Unusual Allergy, " appearing on the Everyday Health Network, Dr. A. Feldweg explained that allergy to sulfites is usually seen in patients with asthma. The typical reaction is a sudden increase in asthma symptoms after eating a food containing sulfites. Studies are performed to estimate the percentage of the nation's million asthmatics who are allergic to sulfites. In one survey, of randomly selected U.S. asthmatics were found to be allergic to sulfites. Find and interpret a confidence interval for the proportion, , of all U.S. asthmatics who are allergic to sulfites.
For what is the phrase "number of failures" an abbreviation?
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