Chapter 1: Q7CQQ (page 1)
AARP Survey Refer to the survey described in Exercise 6. Because the 1019 subjects agreed to respond, do they constitute a voluntary response sample?
No, the study does not constitute a voluntary response sample.
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Determine whether the given source has the potential to create a bias in a statistical study.
Brain Size. A data set in Appendix B includes brain volumes from 10 pairs of monozygotic (identical) twins. The data were collected by researchers at Harvard University, Massachusetts General Hospital, Dartmouth College, and the University of California at Davis.
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d. Among the 1165 respondents, 93 said that a bended knee is corny and outdated. What percentage of respondents said that a bended knee is corny and outdated?
Question: Determine whether the given source has the potential to create a bias in a statistical study.
Chocolate: An article in the Journal of Nutrition (Vol. 130, No. 8) noted that chocolate is rich in flavonoids. The article notes “regular consumption of foods rich in flavonoids may reduce the risk of coronary heart disease.” The study received funding from Mars, Inc., the candy company, and the Chocolate Manufacturers Association.
In Exercises 21–24, refer to the data in the table below. The entries are white blood cell counts (1000 cells,ML) and red blood cell counts (million cells,ML) from male subjects examined as part of a large health study conducted by the National Center for Health Statistics. The data are matched, so that the first subject has a white blood cell count of 8.7 and a red blood cell count of 4.91, and so on.
Subject
| 1 | 2 | 3 | 4 | 5 | |
| White | 8.7 | 5.9 | 7.3 | 6.2 | 5.9 |
| Red | 4.91 | 5.59 | 4.44 | 4.8 | 5.17 |
Context Given that the data are matched and considering the units of the data, does it make sense to use the difference between each white blood cell count and the corresponding red blood cell count? Why or why not?
What’s Wrong? In Exercises 25–28, identify what is wrong.
The electronic cigarette maker V2 Cigs sponsored a poll showing that 55% of
smokers surveyed say that they feel ostracized “sometimes,” “often,” or “always.”
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