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Definition
| Observes individuals and measures variables of interest, but does not attempt to influence the responses. The purpose of an observational study is to describe some group or situation. |
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Definition
| Deliberatelly imposes some treatment on individuals in order to observe their responses. The purpose of an experiment is to study whether the treatment causes a change in response. |
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Definition
| Observations and measurements from which hypotheses can be tested and conclusions drawn about a population. |
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Definition
| Data that are qualitative; observations that fall into separate and distinct categories; ie, nominal and ordinal. |
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Definition
| Unordered categorical data. |
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Definition
| Ordered categorical data. |
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Definition
| Data that are quantitative; observations that are 'measurements'; ie, continuous and discrete. |
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Definition
| Numerical data in which, theoretically, any value within an interval is possible. |
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Definition
| Numerical data for which only certain values are possible. |
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Definition
| The probability, in a hypothesis test, of rejecting the null hypothesis. |
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Term
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Definition
| The probability of getting a value more extreme than your result, when there is no effect in the population. |
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