In the May 2008 New York Times article “More Mothers Breast-Feed, in First Months at Least,” G. Harris reported that 77% of 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 434 infants from the National Health and Nutrition Examination Survey, which involved in-person interviews and physical examinations. Find a 90% confidence interval for the percentage of all new mothers who breast-feed their infants at least briefly.
Answer to relevant QuestionsIn the July 2008 article “Americans Favor Offshore Drilling,” B. Rooney reported on a CNN/Opinion Research Corporation poll that asked what Americans think about offshore drilling for oil and natural gas. Of the 500 U.S. ...x = 35, n = 50, H0: p = 0.6, H0: p > 0.6, α = 0.05 a. Determine the sample proportion. b. Decide whether using the one-proportion z-test is appropriate. c. If appropriate, use the one-proportion z-test to perform the ...In 2006, 9.8% of all U.S. families had incomes below the poverty level, as reported by the U.S. Census Bureau in American Community Survey. During that same year, of 400 randomly selected Wyoming families, 25 had incomes ...A recent Harris Interactive survey found that 92.0% of 1001 American adults said they always wash up after using the bathroom. a. At the 5% significance level, do the data provide sufficient evidence to conclude that more ...x1 = 14, n1 = 20, x2 = 8, n2 = 20; right-tailed test, α = 0.05; 90% confidence interval a. Determine the sample proportions. b. Decide whether using the two-proportions z-procedures is appropriate. If so, also do parts ...
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