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| the type of sampling used when the likelihood of selecting any one member of the population is known |
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| sampling procedure allowing for the equal and independent chance of subjects being selected as part of the sample |
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| process of selecting a sample that represents different groups or levels of a population |
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| probability sampling procedure wherein units of subjects are selected, rather than the subjects themselves |
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| Non-Probability Sampling: |
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| when the likelihood of selecting any one member of the population is unknown |
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| nonprobability sampling procedure wherein the selected sample represents a captive audience for example sophomore college students in an introductory psychology class |
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| nonprobability sampling procedure similar to stratified random sampling in that a particular stratum is the focus, however a specified number is set to be selected and once that number is met no further selection occurs. |
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| representative portion of a population |
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| magnitude of the difference between the characteristics of the sample and the characteristics of the population from which it was selected. |
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| a variable that has a potential influence on the dependent variable |
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| a variable that can take on one of several mutually exclusive values |
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| consistency in the performance or prediction |
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| perfect reflection of true value of that variable |
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score that you actually record or observe
o Observed Score = True Score + Error Score |
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| Error Score – Trait Error/Method Error : |
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| the part of an individual’s error score that is due to characteristics of the test or testing situation |
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| Correlation Coefficient (r): an index of the strength of a relationship between two variables it ranges in value from +1 to -1 and can be positive or negative |
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| truthfulness or accuracy within the score of a test or interpretation of an experiment |
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| measure how well items represent the entire universe |
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| criterion validity (conccurent) |
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| how well a test measures a criteron |
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| criterion validity (predictive) |
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| how well a test predicts a criteria |
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| how well a test measures an underlying construct |
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