Chapter 11: Q.11.6 (page 459)
Regarding the phrase " Number of successes":
a .For what is it an Abbreviation?
b. What symbol is used for it?
(a)The number of individuals from the sample that do not have a particular attribute is abbreviated as "number of failures."
(b) It is denoted by is the sample size.
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In a newspaper or magazine of your choice, find a statistical study that contains an estimated population proportion.
Social Networking. A Pew Internet de American Life Project examined Internet social networking. Among a sample of online adults years old, said they use social networking sites. Determine a confidence interval for the percentage of all online adults years old who use social networking sites.
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.
Government Surveillance. Gallup conducted a national survey of American adults, asking "As you may know, as part of its efforts to investigate terrorism, a federal government agency obtained records from larger U.S. telephone and Internet companies in order to compile telephone call logs and Internet communications. Based on what you have heard or read about the program, would you say that you approve or disapprove of this government program?" Of those surveyed, said they disapprove.
a. Determine and interpret the sample proportion.
b. At the significance level, do the data provide sufficient evidence to conclude that a majority (more than ) of American adults disapprove of this government surveillance program?
11.93 Washing Up. A Harris Interactive survey found that of American adults said they always wash up after using the bathroom.
a. At the significance level, do the data provide sufficient evidence to conclude that more than of Americans always wash up after using the bathroom?
b. Repeat part (a), using a level of significance.
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