Reliability - Consistency of a measuring tool., External reliability - If a measure of something is consistent over time., Internal reliability - If something is consistent within itself (e.g. all Qs on a test measuring the same thing)., Inter-observer reliability - If there is agreement between two (or more) observers. Measured by correlating the observations of observers. , Validity - Trueness or legitimacy of the data collected., Concurrent validity - Comparison of a new psychological test with an existing one, to see if they produce the same score., Ecological validity - If the research finding can be applied outside of the research setting, if it represents everyday life., Face validity - If the items on a psychological test look like what the test is claiming to measure., Temporal validity - If a research finding can be applied to other time periods (i.e. is research done in 1950 applicable now?),

Reliability and Validity

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