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Chapter 1: Q2-6BSC (page 1)
Identify whether the given value is a statistic or a parameter.
CHIS A recent California Health Interview Survey (CHIS) included 2799 adolescent residents of California.
The number of adolescents living in California selected for the survey equal to 2799 represents a statistic.
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Determine whether the data are from discrete data or continuous data set.
Criminal ForensicsWhen studying the relationship between lengths of feet and heights so that footprint evidence at a crime scene can be used to estimate the height of the suspect, a researcher records the exact lengths of feet from a large sample of random subjects.
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.
Reported versus Measured. In a survey of 1046 adults conducted by Bradley Corporation, subjects were asked how often they wash their hands when using a public restroom, and 70% of the respondents said 鈥渁lways.鈥�
a. Identify the sample and the population.
b. Why would better results be obtained by observing hand washing instead of asking about it?
Parameter and Statistic In a Harris Interactive survey of 2276 adults in the United States, it was found that 33% of those surveyed never travel using commercial airlines. Identify the population and sample. Is the value of 33% a statistic or a parameter?
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?
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