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Chapter 1: Q6CQQ (page 1)
Statistic, Parameter In an AARP survey of 1019 randomly selected adults, the respondents were asked to identify the number of credit cards they have, and 26% of them said they had no credit cards. Is the value of 26% a statistic or a parameter?
26% is a statistic.
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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.
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 29鈥�36, answer the given questions, which are related to percentages.
Percentages in Advertising A New York Times editorial criticized a chart caption that described a dental rinse as one that 鈥渞educes plaque on teeth by over 300%.鈥� What is wrong with this statement?
Identify whether the given value is a statistic or a parameter.
Birth Genders In the same study cited in the preceding exercise, 51% of the babies were girls.
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.
MCAT The Medical College Admissions Test (MCAT) is commonly used as part of the decision-making process for determining which students to accept into medical schools. To test the effectiveness of the Siena MCAT preparation course, 16 students take the MCAT test, then they complete the preparatory course, and then they retake the MCAT test, with the result that the average (mean) score for this group rises from 25 to 30. There is a 0.3% chance of getting those results by chance. Does the course appear to be effective?
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.
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