Validity - Methods

notes on validity for methods

a2 psychology with aqa

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  • Created by: Cara
  • Created on: 29-06-12 13:48
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Validity
Internal validity
Does the test measure what it is supposed to measure?
External validity
A type of ecological validity where you need to consider how realistic the situation was and can it be
generalised. Laboratory experiments are artificial an there is generally a low level of external validity
but this is not always the case, e.g. studies by Asch and Sherif into conformity
There are a number of different types of validity:
1. Face validity
The test is examined to see if it measures what it is supposed to measure, e.g. does a maths test
measure the ability to solve mathematical problems
2. Content validity
A more sophisticated version of face validity, where independent experts in the subject area judge
whether the contents fail to test certain skills or are weighted towards some aspects of knowledge
and not others, e.g. maths teachers checking that a maths test is not worded in such a way that it is
testing literacy rather than numeracy skill
3. Predictive validity
A prediction can be based on the score from a test, as to future performance in the same area, e.g.
AS grades and A2 grades
4. Concurrent validity
Results from one test are compared with those obtained from another, established measure, e.g. IQ
score and GCSE results

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