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AP Statistics Practice Test Chapter 5 |
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1) |
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What is the most serious weakness of experiments compared to
observational
studies? Experiments create an artificial
environment |
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2) |
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What are the effects of sample size on the validity of an observational
study or a survey? The larger the sample size the
greater the confidence in the result. Larger sample size also tends to
reduce study to study variability, |
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3) |
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What problem does a double blind test address?
Bias of the researchers and of the subjects |
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4) |
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A marketing expert surveys every 20th person as they walk out the door of a
store. Is this a simple random sample (SRS)? No |
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5) |
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List the main problem that a survey may have which a census will not.
Sampling error |
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6) |
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List the main problem of a census.
Cost (time and money) |
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7) |
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Which technique is designed to reduce bias in experiments?
Randomization |
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8) |
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Describe a double blind test. |
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9) |
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Describe the key factor in matched pairs experiments.
All subjects get all treatments |
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10) |
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Give examples of response bias.
Intimidating question or interviewer |
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11) |
Design a survey for Southside which determines preference in presidential
candidates. decide possible lurking variables, set
up homogeneous strata, label and table within each strata to select the
sample |