Statistical data is rightly seen as a central
feature of much psychological research, but students need to understand the
important methodological processes underpinning the production of such data. In
this film we combine three of our standalone films to go "Behind the Statistics”
to look at the various factors – from sampling techniques, through ideas about
correlation and causation to experimental design – that can influence the
reliability and validity of statistical data.
1. 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.
are relationships and this film begins by illustrating how the strength and
direction of those relationships is measured. It then uses real research
studies to illustrate the uses of correlations, their limitations and how
easily correlation data can be misused.
3. Experimental Design provides practical illustrations of the strengths and limitations
of repeated measures, independent measures and matched pairs experimental
designs. We then look at three classic experimental studies in psychology, the
Stroop Effect, Loftus' eyewitness testimony experiments and Bandura's bobo doll
experiments to show why a particular experimental design was used in each