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Chapter 1: Q3-3BSC (page 1)
Replication In what specific way was replication applied in the study cited in Exercise 1?
The replication was applied to the experiment by the use of large samples for each of the treatments.
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Determine whether the sampling method appears to be sound or is flawed.
Nuclear Power Plants. In a survey of 1368 subjects, the following question was posted on the USA Today website: 鈥淚n your view, are nuclear plants safe?鈥� The survey subjects were Internet users who chose to respond to the question posted on the electronic edition of USA Today.
In Exercises 9鈥�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.
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 per capita consumption of sour cream and the numbers of motorcycle riders killed in noncollision accidents. Therefore, consumption of sour cream causes motorcycle fatalities.
What鈥檚 Wrong? In Exercises 25鈥�28, identify what is wrong.
Potatoes In a poll sponsored by the Idaho Potato Commission, 1000 adults were asked to select their favorite vegetables, and the favorite choice was potatoes, which were selected by 26% of the respondents.
Statistical Significance and Practical Significance. In Exercises 13鈥�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 鈥渢he only proven IQ increasing software in the brain training market,鈥� but the author of your text could find no data supporting that claim, so let鈥檚 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.
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