AP Stats Chapter 12 MC Flashcards
Hoping to get information that would allow them to negotiate new rates with their advertisers, Natural Health magazine phoned a random sample of 600 subscribers. 64% of those polled said they
use nutritional supplements. Which is true?
I. The population of interest is the people who read this magazine.
II. “64%” is not a statistic; it’s the parameter of interest.
III. This sampling design should provide the company with a reasonably accurate estimate of the percentage of all subscribers who use supplements.
A) I only B) I and II only
C) I and III only D) II and III only
E) I, II, and III
C
Suppose the state decides to randomly test high school wrestlers for steroid use. There are 16 teams in the league, and each team has 20 wrestlers. State investigators plan to test 32 of these athletes by randomly choosing two wrestlers from each team. Is this a simple random sample?
A) Yes, because the wrestlers were chosen at random.
B) Yes, because each wrestler is equally likely to be chosen.
C) Yes, because stratified samples are a type of simple random sample.
D) No, because not all possible groups of 32 wrestlers could have been the sample.
E) No, because a random sample of teams was not first chosen.
D
Which statement about bias is true?
I. Bias results from random variation and will always be present.
II. Bias results from a sampling method likely to produce samples that do not represent the
population.
III. Bias is usually reduced when sample size is larger.
A) I only B) II only C) III only D) I and III only E) II and III only
B
A factory has 20 assembly lines producing a popular toy. To inspect a representative sample of 100
toys, quality control staff randomly selected 5 toys from each line’s output. Was this a simple random
sample?
A) Yes, because the toys were selected at random.
B) Yes, because each toy produced had an equal chance to be selected.
C) Yes, because a stratified sample is a type of simple random sample.
D) No, because not all combinations of 100 toys could have been chosen.
E) No, because toys do not come off the assembly line at random.
D
Which is true about sampling?
I. An attempt to take a census will always result in less bias than sampling.
II. Sampling error is usually reduced when the sample size is larger.
III. Sampling error is the result of random variations and is always present.
A) I only B) II only C) III only D) II and III E) all three
D
The owner of a car dealership planned to develop strategies to increase sales. He hoped to learn the reasons why many people who visit his car lot do not eventually buy a car from him. For one month he asked his sales staff to keep a list of the names and addresses of everyone who came in to test drive a
car. At the end of the month he sent surveys to the people who did not buy the car, asking them why. About one third of them returned the survey, with 44% of those indicating that they found a lower price elsewhere. Which is true?
I. The population of interest is all potential car buyers.
II. This survey design suffered from non-response bias.
III. Because it comes from a sample 44% is a parameter, not a statistic.
A) I only B) II only
C) I and II only D) II and III only E) I, II, and III
C
Public opinion A member of the City Council has proposed a resolution opposing construction of a new state prison there. The council members decide they want to assess public opinion before they vote on this resolution. Below are some of the methods that are proposed to sample local residents to determine the level of public support for the resolution. Match each with one of the listed sampling
techniques.
1 cluster 2 convenience 3 judgment 4 multistage 5 simple (SRS) 6 stratified 7 systematic 8 voluntary response
___ a) Place an announcement in the newspaper asking people to call their council representatives to register their opinions. Council members will tally the calls they receive.
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Public opinion A member of the City Council has proposed a resolution opposing construction of a new state prison there. The council members decide they want to assess public opinion before they vote on this resolution. Below are some of the methods that are proposed to sample local residents to determine the level of public support for the resolution. Match each with one of the listed sampling
techniques.
1 cluster 2 convenience 3 judgment 4 multistage 5 simple (SRS) 6 stratified 7 systematic 8 voluntary response
___ b) Have each council member survey 50 friends, neighbors, or co-workers.
2
Public opinion A member of the City Council has proposed a resolution opposing construction of a new state prison there. The council members decide they want to assess public opinion before they vote on this resolution. Below are some of the methods that are proposed to sample local residents to determine the level of public support for the resolution. Match each with one of the listed sampling
techniques.
1 cluster 2 convenience 3 judgment 4 multistage 5 simple (SRS) 6 stratified 7 systematic 8 voluntary response
___ c) Have the Board of Elections assign each voter a number, then select
400 of them using a random number table.
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Public opinion A member of the City Council has proposed a resolution opposing construction of a new state prison there. The council members decide they want to assess public opinion before they vote on this resolution. Below are some of the methods that are proposed to sample local residents to determine the level of public support for the resolution. Match each with one of the listed sampling
techniques.
1 cluster 2 convenience 3 judgment 4 multistage 5 simple (SRS) 6 stratified 7 systematic 8 voluntary response
___ d) Go to a downtown street corner, a grocery store, and a shopping
mall; interview 100 typical shoppers at each location.
3
Public opinion A member of the City Council has proposed a resolution opposing construction of a new state prison there. The council members decide they want to assess public opinion before they vote on this resolution. Below are some of the methods that are proposed to sample local residents to determine the level of public support for the resolution. Match each with one of the listed sampling
techniques.
1 cluster 2 convenience 3 judgment 4 multistage 5 simple (SRS) 6 stratified 7 systematic 8 voluntary response
___ e) Randomly pick 50 voters from each election district.
6
Public opinion A member of the City Council has proposed a resolution opposing construction of a new state prison there. The council members decide they want to assess public opinion before they vote on this resolution. Below are some of the methods that are proposed to sample local residents to determine the level of public support for the resolution. Match each with one of the listed sampling
techniques.
1 cluster 2 convenience 3 judgment 4 multistage 5 simple (SRS) 6 stratified 7 systematic 8 voluntary response
___ f) Call every 500th person in the phone book.
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Public opinion A member of the City Council has proposed a resolution opposing construction of a new state prison there. The council members decide they want to assess public opinion before they vote on this resolution. Below are some of the methods that are proposed to sample local residents to determine the level of public support for the resolution. Match each with one of the listed sampling
techniques.
1 cluster 2 convenience 3 judgment 4 multistage 5 simple (SRS) 6 stratified 7 systematic 8 voluntary response
___ g) Randomly pick several city blocks, then randomly pick 10 residents
from each block..
4
Public opinion A member of the City Council has proposed a resolution opposing construction of a new state prison there. The council members decide they want to assess public opinion before they vote on this resolution. Below are some of the methods that are proposed to sample local residents to determine the level of public support for the resolution. Match each with one of the listed sampling
techniques.
1 cluster 2 convenience 3 judgment 4 multistage 5 simple (SRS) 6 stratified 7 systematic 8 voluntary response
___ h) Randomly select several city blocks; interview all the adults living on each block.
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