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Chapter 1: Q10 (page 10)
Determine whether the sampling method appears to be sound or is flawed.
Clinical Trials. Researchers at Yale University conduct a wide variety of clinical trials by using subjects who volunteer after reading advertisements soliciting paid volunteers.
The sampling method is flawed.
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In Exercises 29–36, answer the given questions, which are related to percentages.
Percentages in Advertising Continental Airlines ran ads claiming that lost baggage is “an area where we’ve already improved 100% in the past six months.” What is wrong with this statement?
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.
Gender Selection In a study of the Gender Aide method of gender selection used to increase the likelihood of a baby being born a girl, 2000 users of the method gave birth to 980 boys and 1020 girls. There is about a 19% chance of getting that many girls if the method had no effect.
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.
What’s Wrong with This Picture? The Newport Chronicle ran a survey by asking readers to call in their response to this question: “Do you support the development of atomic weapons that could kill millions of innocent people?” It was reported that 20 readers responded and that 87% said “no,” while 13% said “yes.” Identify four major flaws in this survey.
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.
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