Measurement: Reliability and Validity. For a measure to be useful, it must be both reliable and valid Reliable = consistent in producing the same results every time the measure is used Valid = measuring what it is supposed to measure. Reliability.
Related searches for Measurement: Reliability and Validity
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Observed Score = true score + systematic error + random error
Random ErrorObserved Score =
Types of reliability
Types of Validity
Score = effect + systematic + random error
threat to validity
threat to reliability