Chapter 1: Q2-11BSC (page 1)
Identify whether the given value is a statistic or a parameter.
Titanic A study was conducted of all 2223 passengers aboard the Titanic when it sank.
For a study, the value of 2223 representing the total number of passengers aboard the Titanic is a parameter.
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Statistical Significance and Practical Significance. In Exercises 13–16, determine whether the results appear to have statistical significance, and also determine whether the results appear to have practical significance.
IQ Scores Most people have IQ scores between 70 and 130. For $39.99, you can purchase a PC or Mac program from HighIQPro that is claimed to increase your IQ score by 10 to 20 points. The program claims to be “the only proven IQ increasing software in the brain training market,” but the author of your text could find no data supporting that claim, so let’s suppose that these results were obtained: In a study of 12 subjects using the program, the average increase in IQ score is 3 IQ points. There is a 25% chance of getting such results if the program has no effect.
Quantitative/categorical DataIdentify each of the following as quantitative data or categorical data.
a. The platelet counts in Data Set 1 “Body Data” in Appendix B.
b. The cigarette brands in Data Set 13 “Cigarette Contents” in Appendix B.
c. The colours of the M&M candies in Data Set 27 “M&M Weights” in Appendix B.
d. The weights of the M&M candies in Data Set 27 “M&M Weights” in Appendix
In Exercises 9–12, determine whether the sampling method appears to be sound or is flawed.
Smartphone Usage In a survey of smartphone ownership, the Pew Research Center randomly selected 1006 adults in the United States.
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.
Source of the Data Considering the source of the data, does that source appear to be biased in some way?
Determine whether the data are from discrete data or continuous data set.
McDonald’s In a study of service times at a McDonald’s drive-up window, the numbers of cars serviced each hour of several days are recorded.
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