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Chapter 1: Q8CQQ (page 1)
Observational Study or Experiment Are the data described in Exercise 6 the result of an observational study or an experiment?
The data described is an observational study.
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What鈥檚 Wrong? In Exercises 25鈥�28, identify what is wrong.
Motorcycles and Sour Cream: In recent years, there has been a strong correlation between the per capita consumption of sour cream and the number of motorcycle riders killed in non-collision accidents. Therefore, consumption of sour cream causes motorcycle fatalities.
In Exercises 29鈥�36, answer the given questions, which are related to percentages.
Percentages in Advertising: An ad for Big Skinny wallets included the statement that one of their wallets 鈥渞educes your filled wallet size by 50%鈥�200%.鈥� What is wrong with this statement?
Quantitative/categorical DataIdentify each of the following as quantitative data or categorical data.
a. The platelet counts in Data Set 1 鈥淏ody Data鈥� in Appendix B.
b. The cigarette brands in Data Set 13 鈥淐igarette Contents鈥� in Appendix B.
c. The colours of the M&M candies in Data Set 27 鈥淢&M Weights鈥� in Appendix B.
d. The weights of the M&M candies in Data Set 27 鈥淢&M Weights鈥� in Appendix
In Exercises 21鈥�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.
Conclusion: If we analyze the sample data and conclude that there is a correlation between white blood cell counts and red blood cell counts, does it follow that higher white blood cell counts are the cause of higher red blood cell counts?
The complete set of all housing units equal to 132,802,859 present in the United States represents a parameter.
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