A Pew Internet & American Life project examined Internet social networking by age group. According to the report, among online adults 18–24 years of age, 75% have a profile on at least one social networking site. Assuming a sample size of 328, determine a 95% confidence interval for the percentage of all online adults 18–24 years of age who have a profile on at least one social networking site.
Answer to relevant QuestionsIn 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 ...x = 10, n = 40, H0: p = 0.3, H0: p < 0.3, 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 ...The Substance Abuse and Mental Health Services Administration conducts surveys on drug use by type of drug and age group. Results are published in National Household Survey on Drug Abuse. According to that publication, 13.6% ...In a Zogby International Poll, conducted in early 2006 in conjunction with Le Moyne College’s Center for Peace and Global Studies, roughly 29% of the 944 military respondents serving in Iraq in various branches of the ...x1 = 18, n1 = 40, x2 = 30, n2 = 40; left-tailed test, α = 0.10; 80% 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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