2014 AP Statistics統(tǒng)計(jì)學(xué)真題Practice Exam系列之選擇題免費(fèi)下載

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6）Approximately 52 percent of all recent births were boys. In a simple random sample of 100 recent births, 49 were boys and 51 were girls. The most likely explanation for the difference between the observed results and the expected results in this case is

1. bias
2. variability due to sampling
3. nonsampling error
4. a sampling frame that is incomplete
5. confounding

8) For flights from a particular airport in January, there is a 30 percent chance of a flight being delayed because of icy weather. If a flight is delayed because of icy weather, there is a 10 percent chance the flight will also be delayed because of a mechanical problem. If a flight is not delayed because of icy weather, there is a 5 percent chance that it will be delayed because of a mechanical problem. If one flight is selected at random from the airport in January, what is the probability that the flight selected will have at least one of the two types of delays?

1. 0.065
2. 0.335
3. 0.350
4. 0.450
5. 0.665

9) A survey was administered to parents of high school students in a certain state to see if the parents thought the students’ academic needs were being met. To select the sample, the parents were divided into two groups— one group of parents who live in cities with populations of more than 100,000 and the other group of parents who live in cities with populations less than or equal to 100,000. A random sample of 100 parents from each group was taken. Which of the following statements about the sample of 200 parents is true?

1. It is a convenience sample because the sample of parents was easily obtained.
2. It is a stratified random sample because parents were randomly selected from each group.
3. It is a random cluster sample because parents were randomly selected from each group.
4. It is a random cluster sample because groups of high schools were randomly selected.
5. It is a systematic sample because the parents were systematically divided into two groups.

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