Chapter 1: Q2-7BSC (page 1)
The complete set of all housing units equal to 132,802,859 present in the United States represents a parameter.
The complete set of all housing units equal to 132,802,859 present in the United States represents a parameter.
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Falsifying Data A researcher at the Sloan-Kettering Cancer Research Center was once criticized for falsifying data. Among his data were figures obtained from 6 groups of mice, with 20 individual mice in each group. The following values were given for the percentage of successes in each group: 53%, 58%, 63%, 46%, 48%, 67%. What’s wrong with those values?
Question: Statistical Significance versus Practical Significance. When testing a new treatment, what is the difference between statistical significance and practical significance? Can a treatment have statistical significance but not practical significance?
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?
Online Medical Info. USA Today posted this question on its website: “How often do you seek medical information online?” Of 1072 Internet users who chose to respond, 38% of them responded with “frequently.” What term is used to describe this type of survey in which the people surveyed consist of those who decided to respond? What is wrong with this type of sampling method?
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.
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?
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