WorksheetsStatistics Review 2
Total questions: 12
Worksheet time: 8mins
A department store mails a customer satisfaction survey to people who make credit card purchases at the store. This month, 45,000 people made credit card purchases. Surveys are mailed to 1000 of these people, chosen at random, and 137 people return the survey form. The population is:
45,000 people who made credit card purchases this month
1000 people chosen at random to receive surveys
137 people who returned the survey
None of these answers
A department store mails a customer satisfaction survey to people who make credit card purchases at the store. This month, 45,000 people made credit card purchases. Surveys are mailed to 1000 of these people, chosen at random, and 137 people return the survey form. The sample is:
45,000 people who made credit card purchases this month
1000 people chosen at random to receive surveys
137 people who returned the survey
None of these answers
The manager at Paneras surveys every tenth person leaving the restaurant. Only 12 out of the 40 people asked respond to the survey. This is an example of:
Response bias
Undercoverage
Cluster sample
Nonresponse
Your teacher asks each student individually how much they enjoy the class on a scale of 1 to 10. The results might not reflect students' actual feelings due to:
Response bias
Undercoverage
Voluntary response bias
Nonresponse
A school administrator is interested in how long it takes students to get to school in the morning. She asks the first 20 students to arrive at school how long it took them. The sampling method and problem with the approach is:
Convenience sample; students who arrive at school early may have a shorter trip
Voluntary sample; students don't have to answer the question
Simple Random Sample; Response bias - students are likely to lie
Simple Random Sample; Undercoverage - some students have no chance of being selected
A website offers a poll to all users, asking them how much they plan to exercise in the next month. 85% of the 5,000 respondents indicated they would exercise at least 10 times next month. Which of the following is most likely?
85% Americans will exercise at least 10 times next month
Because it is a convenience sample, the poll does not tell us much.
Because it is a voluntary sample, the poll does not tell us much.
There are not enough respondents to draw a conclusion.
Assign each car in a dealership a number and then use a random number generator to select the cars to be inspected.
systematic
simple random sample
convenience
voluntary response
Political webpages often allow readers to rate (if they want to) whether they strongly agree, agree, disagree, or strongly disagree with the President's decision on any given situation. This is a form of:
Voluntary Response Sampling
Convenience Sampling
Simple Random Sampling
Systematic Random Sampling
A track coach wants to test the effects of a new training regimen. She randomly assigns runners one of three weight training regimens (high rep count, low rep count, or minimal) and one of two hopping methods (single leg or alternate leg). After two weeks, she calculates the improvement in sprint times. The number of explanatory variables is:
(a)
A track coach wants to test the effects of a new training regimen. She randomly assigns runners one of three weight training regimens (high rep count, low rep count, or minimal) and one of two hopping methods (single leg or alternate leg). After two weeks, she calculates the improvement in sprint times. The number of treatments is:
(a)
Is fish good for the gut? Researchers tracked 22,000 male physicians for 22 years. Those who reported eating seafood of any kind at least 5 times per week had a 40% lower risk of colon cancer than those who said they ate seafood less than once a week. This is an example of
an observational study, and the response variable was rate of colon cancer.
an observational study, and the response variable was seafood consumption.
an experiment, and the response variable was rate of colon cancer.
an experiment, and the response variable was seafood consumption.
Is fish good for the gut? Researchers tracked 22,000 male physicians for 22 years. Those who reported eating seafood of any kind at least 5 times per week had a 40% lower risk of colon cancer than those who said they ate seafood less than once a week. We can conclude that:
Eating seafood reduces the risk of colon cancer for all people since the reduction in risk was so large.
We can't conclude cause and effect since there may be a confounding variable.
Eating seafood reduces the risk of colon cancer for male doctors since the reduction in risk was so large.
We can't conclude cause and effect because the subjects were not randomly selected.
