# Psychology AQA reliability

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• Reliability
• Extent to which the mesurment of a particular behaviour is  consistent
• If the research can be easily repeated and produce similar results
• External reliability
• TEST RETEST- Giving the same test to the same participant  on a different occasion, after they 'forget' the Qs.Reliable IF results correlate
• Measures consistency from one occasion to another. (eg.different day/lab/time)
• Internal Reliability
• SPLIT-HALF method - randomly choosing half of the answers from a test and comparing it with the other half. Reliable IF there is a + correlation.
• extemt to which a test is consistent withing itself (eg/ questionnaiters should be measuring the sme thing.)
• Improving researcher reliability
• INTRA RATER- consistency of a researcher's behaviour. SHould produce similar results
• INTER RATER- consistency between DIFFERENT researchers on the same study.
• Improved by: training observers & ensuring behaviour categories are operaionalised
• Extent to which the mesurment of a particular behaviour is  consistent
• If the research can be easily repeated and produce similar results
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