Psychological Investigations : Reliability and Validity
- Created by: Thomas J Betambeau
- Created on: 21-05-13 23:47
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- Reliability and validity
- Validity refers to what extent a study is measuring what it is supposed to be measuring
- The main way to evaluate the validity of a measuring device is by looking at the face validity
- Face validity refers to the extent to which a measure appears on the surface to measure what it is suppose to measure.
- You can also look at the validity of a procedure
- Can it be generalised?
- Is it ecologically valid?
- The main way to evaluate the validity of a measuring device is by looking at the face validity
- Reliability refers to how consistent a study or measuring device is
- A measurement is said to be reliable if the measurement can produce similar results if used again in similar circumstances.
- There are two types of reliability
- Internal
- Internal reliability refers to the extent to which a measure is consistent within itself.
- One way of testing reliability is repeating the same question in a questionnaire. If the answers are the same, it has a high reliability
- External
- External reliability refers to the extent to which a measure varies from one use to another
- One way of testing reliability is doing the same test again on the same participant, for example an IQ test. If the scores are the same/close, it has high reliabilty
- Internal
- Validity refers to what extent a study is measuring what it is supposed to be measuring
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