AP Statistics Quiz 3A-3B Chapters 11/12
A television station broadcast a court trial in its entirety. During a news program, viewers were asked to go to the TV station's website and state whether they thought the defendant was guilty or not guilty. Of the 1,840 viewers who gave their opinion, 1,521 felt that the defendant was not guilty. The viewers who registered their opinions constitute a) a population b) a convenience sample c) a voluntary response sample d) a probability sample e) a stratified random sample
A voluntary response sample
Randomly select an employee classification and test all the people who work in that classification - supervisors, full time clerks, part time clerks, and maintenance staff
Cluster Sampling
The January 2005 Gallup Youth Survey telephoned a random sample of 1,028 U.S teens aged 13-17 and asked these teens to name their favorite movie from 2004. Napoleon Dynamite had the highest percentage with 8% of teens ranking it as their favorite movie. Which is true? I. The population of interest is U.S. teens aged 13-17 II. 8% is a statistic and not the actual percentage of all U.S. teens who would rank this movie as their favorite III. This sampling design should provide a reasonably accurate estimate of the actual percentage of all U.S. teens who would rank this movie as their favorite. a) I only b) II only c) III only d) I and II e) I, II, and III
I, II, and III
A basketball player has a 70% free throw percentage. Which plan could be used to simulate the number of free throws she will make in her next five free throw attempts? I. Let 0,1 represent making the shot, 2, 3 represent making the second shot,...,8, 9 represent making the fifth shot. Generate five random numbers 0-9, ignoring repeats II. Let 0, 1, 2 represent missing a shot and 3, 4,..,9 represent making a shot. Generate five random numbers 0-9 and count how many numbers are in 3-9. III. Let 0, 1, 2 represent missing a shot and 3, 4,...,9 represent making a shot. Generate five random numbers 0-9 and count how many numbers are in 3-9, ignoring repeats. a) I only b) II only c) III only d) II and III e) I, II, and III
II and III
Each employee has a three-digit identification number. Randomly choose 40 numbers.
Simple Random Sampling
There are four employee classifications: supervisors, full time clerks, part time clerks, and maintenance staff. Randomly select ten people from each category
Stratified Sampling
Choose the fourth person that arrives to work for each shift.
Systematic Sampling
Suppose your local school district decides to randomly test high school students for attention deficit disorder (ADD). There are three high schools in the district, each with grades 9-12. The school board pools all of the students together and randomly samples 250 students. Is this a simple random sample? a) Yes, because the students are chosen at random b) Yes, because each student is equally likely to be chosen c) Yes, because they could have chosen any 250 students from throughout the district d) No, because we can't guarantee that there are students from each school in the sample e) No, because we can't guarantee that there are students from each grade in the sample
Yes, because they could have chosen any 250 students from throughout the district
Sampling error is best described as a) untruthful replies from respondents b) natural variation that is present when data is collected from a sample instead of from the entire population c) unintentional mistakes a researchers makes when collecting data d) the ethical error made during a clinical trial when the researcher tells patients whether they are in the experimental group of the placebo group e) the crafting of survey questions in such a biased way that a desired response will be elicited more easily from respondents
natural variation that is present when data is collected from a sample instead of from the entire population
