Term
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Definition
| an experiment manipulates factor levels to create treatments, randomly assigns subjects to these treatment levels, and then compares the responses of the subject groups across different treatment levels. |
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Term
| 4 Principles of Experimental Design |
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Definition
1. control
2. randomize
3. replicate
4. block |
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Term
| The best experiments are what 4 things? |
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Definition
1. randomized
2. comparative
3. double blind
4. placebo controlled |
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Term
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Definition
| a study that asks questions of a sample drawn from some population in the hope of learning something about the entire population. |
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Term
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Definition
| the experimental units assigned to a baseline treatment level, which is well understood, or a null, placebo treatment |
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Term
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Definition
| when the levels of one factor are associated with the levels of another factor in such a way that their effects cannot be separated. |
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Term
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Definition
| when randomization only occurs within blocks |
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Term
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Definition
| a variable associated with both x and y that makes it appear that x is causing y |
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Term
| retrospective observational study |
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Definition
| an observation study in which subjects are selected and then their previous conditions or behaviors are determined |
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Term
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Definition
| a treatment known to have no effect, administered so that all groups experience the same conditions |
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Term
| single blind & double blind |
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Definition
there are 2 main classes of individuals who can affect the outcome of an experiment:
- those who can influence the results
- those who evaluate the results
single blind: when everyone in EITHER class is blinded
double blind: when everyone in BOTH classes is blinded |
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Term
| statistically significant |
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Definition
| when an observed difference is too large for us to believe that it is likely to have occurred naturally |
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Term
| prospective observational study |
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Definition
| an observational study in which subjects are followed to observe future outcomes |
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Term
| what kinds of graphs lend themselves best to comparing groups? |
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Definition
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