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19 Cards in this Set
- Front
- Back
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Experiment |
Actively impose some treatment in order to observe the response |
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Statistical Inference |
Provides ways to answer questions from data with some guaruntee answers are good |
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Population |
The intire group of individuals that we want information about |
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Census |
A sample the consists of the entire population |
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Sample |
A part of the population thay we actually examine in order to hather information |
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Sample Design |
Refers to the method used to choose the sample from the population |
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Bias |
The design of a study is biased if it systematically favors certain outcomes |
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Convenience |
Chposing individuals from the population who are eady to reach results in a conveniece sample |
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Voluntary Response |
Consists of people who choose themselves rrsponding to a general invitation |
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SRS (Simple Random Sample) |
Of size n consists of n individual from the population choosen in such a way that every set of individuals has an equal chance to thr sample actually selected |
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Stratified Random Sample |
Divide the population into groups of similar individuals called strata, then choose a seperate SRS in each stratum and combine to form a full sample |
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Cluster Sample |
Classify the population into groups of individuals that are located near each other then choose an SRS of cluster |
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Undercoverage |
when some groups in the population are left out of the process of choosing the sample |
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Non-response |
when an individual chosen for the sample can't be contacted or refuses to cooperate |
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Response Bias |
respondents may lie, especially if asked about illegal/ unpopular behavior; race, sex of the interviewer can influence responses |
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Wording of questions |
confusing or leading questions can introduce strong bias |
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Voluntary Response Sample |
Consists of people who choose themselves |
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Confounding |
Two variables are cofounded when effects on a response vsriable cant be distinguished from each other |
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Undercoverage |
When some groups in the population are left out of process of choosing the sample |
