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| A method that allows researchers the results of several different studies on a similar topic in order to establish the strength of an effect |
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| A broad idea or set of closely related ideas that attempts to explain certain observations |
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| An objective of how a research variable is going to be measured and observed |
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| an idea that is arrived at logically from a theory. It is a prediction that can be tested |
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| the entire group about which that investigator wants to draw conclusions |
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| The subset of the population chosen by the investigator for study |
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| A sample that gives every member of the population an equal chance of being selected |
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