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The penultimate batch of films is once again methods-related, although the general focus with these four films is methodology in psychology.

Each has been designed to help teachers introduce different topics in a simple, visual, way.

Reliability and Validity 
5 minutes
Psychologists have told us a lot about human behaviour, but can we trust the findings? This film looks at the part played by reliability and validity in helping to answer this question. Reliability and external and internal validity are explained and the key tests of face, concurrent and ecological validity are illustrated with examples from major psychological studies.

Sampling…

Sampling 
6 minutes
Sampling is crucial in psychology but can be difficult to understand. This film offers a helping hand with a series of visual images that take students through target population, samples, representativeness and generalisability. It then looks at how sampling is done, illustrating differences between probability and non-probability sampling, why different techniques are used and their strengths and limitations. The final part looks at how this knowledge can be used to help evaluate any study based on sampling.

Reductionism 
4 minutes
This film illustrates both the importance and limitations of reductionism in psychological explanation using the example of research into diet and obesity. It compares reductionism and holism and cautions students against simply using reductionism as a critique to be compared unfavourably with holism.

Variables 
4 minutes
Although the idea of variables can seem dull and uninspiring, they are crucial because they’re everywhere in psychology. This film provides a clear introduction to this concept, explaining and illustrating the key questions of definition, types, reliability, validity and application.

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