Reliability
Two or more measurements/observations of the same psychological event are consistent with each other
Validity
The extent to which a test measures what it is intended to measure
Internal Validity:
If the outcome is the result of variables that are manipulated in the study
External Validity:
The extent to which findings can be generalised to settings other than the research setting.
e.g. Population validity, ecological validity.
Ecological Validity - How closely the methods, materials and setting of the experiment approximate the real-life situation being studied
Face Validity:
Whether or not the test is based on subjective interpretation. Does it appear to measure what it has been designed to measure
Concurrent Validity:
Comparing the results of a new test with that of an old test known to have good validity
Predictive Validity:
The ability to predict performance on future tests
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