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15 Cards in this Set
- Front
- Back
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experiment |
When subject is treated |
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Observational Study |
Look at something that happened |
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Population |
the whole group |
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Sample |
part of the population |
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bias |
sampling method that systematically favors one outcome |
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Voluntary response Sampling |
a pole or survey where responding is optional |
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Convenience Sampling |
choosing individuals because they are easiest to reach |
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Question Word Bias |
Question is asked in a manor that can cause results to be bias |
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Simple Random Sample (SRS) |
Every possible sample of the desired size has an equal chance of being selected In all well designed experiments |
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Stratified Random Sampling (Block Design) |
Whole group is divided into groups of similar characteristics ( age, gender) important to the study. Then take SRS of each group and combine them to form full sample |
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Cluster sampling |
Population divided into different groups and then do a random sample to decide which groups we look at. |
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Undercoverage |
Some groups are left out of the process of choosing the sample. No fault of their own they dont have an opportunity to be in sample. |
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Nonresponse |
Individuals refuse to answer |
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Response Bias |
People don't answer questions honestly. the questions or questioner influences their answers in some way |
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Matched Pairs |
Match up each subject with someone that is similar in some way (basically blocks of 2) |
