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Chapter 1: Q2-6BSC (page 1)
Identify whether the given value is a statistic or a parameter.
CHIS A recent California Health Interview Survey (CHIS) included 2799 adolescent residents of California.
The number of adolescents living in California selected for the survey equal to 2799 represents a statistic.
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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.”
Reported versus Measured. In a survey of 1046 adults conducted by Bradley Corporation, subjects were asked how often they wash their hands when using a public restroom, and 70% of the respondents said “always.”
a. Identify the sample and the population.
b. Why would better results be obtained by observing hand washing instead of asking about it?
In Exercises 29–36, answer the given questions, which are related to percentages.
Workplace Attire In a survey conducted by Opinion Research Corporation, 1000 adults were asked to identify “what is inappropriate in the workplace.” Of the 1000 subjects, 70% said that miniskirts were not appropriate in the workplace.
a. What is 70% of 1000?
b. Among the 1000 respondents, 550 said that shorts are unacceptable in the workplace. What percentage of respondents said that shorts are unacceptable in the workplace?
In Exercises 29–36, answer the given questions, which are related to percentages.
Workplace Attire In a survey conducted by Opinion Research Corporation, 1000 adults were asked to identify “what is inappropriate in the workplace.” Of the 1000 subjects, 70% said that miniskirts were not appropriate in the workplace.
a. What is 70% of 1000?
b. Among the 1000 respondents, 550 said that shorts are unacceptable in the workplace. What percentage of respondents said that shorts are unacceptable in the workplace?
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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