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Chapter 1: Q9CQQ (page 1)
Physicians’ Health Study In the Physicians’ Health Study, some of the subjects were treated with aspirin while others were given a placebo. For the subjects in this experiment, what is blinding?
Blinding for subjects is assigning either of the two treatments to them without their knowledge.
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In Exercises 29–36, answer the given questions, which are related to percentages.
Percentages in Advertising A New York Times editorial criticized a chart caption that described a dental rinse as one that “reduces plaque on teeth by over 300%.” What is wrong with this statement?
In Exercises 29–36, answer the given questions, which are related to percentages.
Chillax USA Today reported results from a Research Now for Keurig survey in which 1458 men and 1543 women were asked this: “In a typical week, how often can you kick back and relax?”
a. Among the women, 19% responded with “rarely, if ever.” What is the exact value that is 19% of the number of women surveyed?
b. Could the result from part (a) be the actual number of women who responded with “rarely, if ever”? Why or why not?
c. What is the actual number of women who responded with “rarely, if ever”?
d. Among the men who responded, 219 responded with “rarely, if ever.” What is the percentage of men who responded with “rarely, if ever.”?
e. Consider the question that the subjects were asked. Is that question clear and unambiguous so that all respondents will interpret the question the same way? How might the survey be improved?
Identify whether the given value is a statistic or a parameter.
Triangle Fire Fatalities: A deadly disaster in the United States was the Triangle Shirtwaist Factory Fire in New York City. A population of 146 garment workers died in that fire.
Determine whether the data are from discrete data or continuous data set.
CHIS :Among the subjects surveyed as part of the California Health Interview Survey (CHIS), several subjects are randomly selected and their heights are recorded.
In Exercises 29–36, answer the given questions, which are related to percentages.
Marriage Proposals In a survey conducted by TheKnot.com, 1165 engaged or married women were asked about the importance of a bended knee when making a marriage proposal. Among the 1165 respondents, 48% said that the bended knee was essential.
a. What is the exact value that is 48% of 1165 survey respondents?
b. Could the result from part (a) be the actual number of survey subjects who said that a bended knee is essential? Why or why not?
c. What is the actual number of survey respondents saying that the bended knee is essential?
d. Among the 1165 respondents, 93 said that a bended knee is corny and outdated. What percentage of respondents said that a bended knee is corny and outdated?
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