Description
1–In a poll of 1358 adults nationwide, asking whether they favor or oppose teachers and school officials carrying guns in school,52% were opposed. The margin of error is 4 percentage points. Use the given statistic and margin of error to identify the range of values (confidence interval) likely to contain the true value of the population parameter.
The confidence interval is from enter your response here% to
enter your response here%.
(Type integers or decimals. Do not round. Use ascending order.)
2-Determine whether a census is practical in the situation described. Explain your reasoning.
You want to determine the mean height of all volleyball players on a team.
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Choose the correct answer below.
A census ispractical.The population consists of the small number of players on a team, and it iseasy to obtain theirheights.
A census is not practical.The population consists of the large number of player on a team and it
is not easyto obtain theirheights.
3-Determine whether there is a potential for bias and explain your answer.
A magazine, which does not accept free products or advertising from anyone, prints a review of new cars.
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Choose the correct answer.
A.
There do not appear to be any sources of bias, because the magazine does not accept free products or run advertisements, it is most likely not influenced by the manufacturers of the cars that it reviews.
B.
There does appear to be at least one source of bias, because the magazine does not accept free products or run advertisements, it is likely to have been influenced by the manufacturers of the cars that it reviews.
C.
There do not appear to be any sources of bias, because the magazine does not accept free products or run advertisements, it is likely to have been influenced by the manufacturers of the cars that it reviews.
D.
There does appear to be at least one source of bias, because the magazine does not accept free products or run advertisements, it is most likely not influenced by the manufacturers of the cars that it reviews.
4-Determine whether there is a potential for bias and explain your answer.
A company hires independent university scientists to determine whether its new, genetically engineered soybean poses any threat to the environment.
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Choose the correct answer.
A.
There do not appear to be any sources of bias, because the scientists were from a university, so they can be trusted to have an impartial result.
B.
There do not appear to be any sources of bias, because the scientists were hired, so they are professionals that are being paid to do a job correctly.
C.
There is a possibility of bias, because the scientists were hired, so they receive funding from the company that wants its product tested.
D.
There is a possibility of bias, because the scientists were from a university, so they cannot be trusted to have an impartial result.
4-In phase II testing of a new drug designed to increase the red blood cell count, a researcher obtains envelopes with the names and addresses of all treated subjects. She wants to increase the dosage in a sub-sample of 35 subjects, so she thoroughly mixes all of the envelopes in a bin, then pulls 35 of those envelopes to identify the subjects to be given the increased dosage.
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What type of sampling is used?
Stratified sample
Cluster sample
Simple random sample
Systematic sample
Convenience sample
On days of senate elections, the news media organize an exit poll in which specific polling stations are randomly selected and all voters are surveyed as they leave the premises.
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Part 1
What type of sampling is used?
Convenience sampling
Systematic sampling
Cluster sampling
Stratified sampling
Simple random sampling
A college dean obtains an alphabetical list of all full-time students at her college and she selects every 12th name on that list and interviews those students to find the amount of student debt incurred by each of them. She uses the results to estimate the average (mean) amount of student debt incurred by college students in the United States.
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Part 1
What type of sampling is used?
Cluster sampling
Systematic sampling
Stratified sampling
Simple random sampling
Convenience sampling
Determine whether the following study is an observational study, an experiment, or a meta-analysis, and explain your choice.
In a study of the effects of magnets on increasing appetite, some participants were treated with magnets while others were given non-magnetic objects with a similar appearance. The magnets did not appear to be effective in increasing appetite.
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Choose the correct answer below.
A.
The study is an observational study, because the participants were observed.
B.
The study is a meta-analysis, because the study was done on a group.
C.
The study is a meta-analysis, because an analysis of the data was used to determine effectiveness.
D.
The study is an experiment, because magnets are used.
E.
The study is an experiment, because there is a treatment group and a control group.
F.
The study is an observational study, because it is a retrospective study using data from the pas
—When author Shere Hite wrote Women and Love: A Cultural Revolution in Progress,
she based conclusions about the general population of all women on 4500 replies that she received after mailing
100,000 questionnaires to various women’s groups. Identify and explain a source of bias in this study. Then suggest how the bias might have been avoided.
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Part 1
Identify and explain a source of bias in this study. Choose the correct answer.
A.
The author wrote the questionnaires.
B.
Returning the questionnaires was voluntary.
C.
The questionnaires were only sent to women.
D.
An insufficient number of questionnaires were sent.
