First 296 words of the document:
Concerns consistency. It refers to how much we can depend
on a particular measurement. If we repeat the experiment,
would we still get the same results?
Experimental research: A reliable study is also one that is
replicable. To be replicated all conditions must be the same
otherwise unequal results may be due to changed conditions
rather than an unreliable test.
Observational Techniques: observations should be consistent,
which ideally means that 2 or more observers collect the same
results from the same experiment. This is also known as inter-
observer reliability. This can be tested through training the
observers so they are all clear about what signs and codings to
use etc. Also operationalising terms can improve
understanding and therefore reliability of results.
Questionnaires and Interviews: INTERNAL RELIABILITY= is the
extent to which something is true to itself e.g. all questions in
an IQ test should measure the same thing. This can be
achieved by using the split half method. By testing half of the
questions from different sections, you can research whether
they are testing the same thing... if they have the same results
they measure the same things. EXTERNAL RELIABILITY= A
measure of consistency over a longer period of time. To test
this you can use the test- retest method. This is when you get
a participant to do a test then a specific time later, redoing it.
If the results are the same or similar then it shows the test is
reliable. Reliability also concerns whether 2 or more
interviewers can come to the same conclusion/ results. This is
known as inter interviewer reliability.