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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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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.”
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.
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 17–20, refer to the sample of body temperatures (degrees Fahrenheit) in the table below. (The body temperatures are from a data set in Appendix B.)
| 1 | 2 | 3 | 4 | 5 | |
| 8 AM | 97 | 98.5 | 97.6 | 97.7 | 98.7 |
| 12 AM | 97.6 | 97.8 | 98 | 98.4 | 98.4 |
Conclusion Given the body temperatures in the table, what issue can be addressed by conducting a statistical analysis of the data.
In Exercises 9–12, determine whether the sampling method appears to be sound or is flawed.
Credit Card Payments In an AARP, Inc. survey of 1019 randomly selected adults, each was asked how much credit card debt he or she pays off each month.
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