I m carrying out a study on innovative teaching methods, the teaching methods are relatively new in the research area. however, teachers are to be trained on the application of these methods in practical classroom situation and a pre-test will be administered to students before the treatment and post-test after the treatment. both the pre-test and post-test will make use of past WAEC and NECO questions (Standardized instruments). In this case do i need a reliability test again?
I do not think that you will reascertain yourself of the reliability of standardized tests if these tests have been found to produce reliable results in a similar population and you did not use a modified (shortened or translated) version of said test.
I also think that low relianbility scores should decrease your chances of finding hypothesized effects or associations because, in general lower reliability is related to higher unsystematic variance. It should thus not be necessary to convince anybody that your reliability scores of said tests were high enough, but reliability analysis could be a good start for post-hoc exploration when you did find results that were at odds with your hypotheses.
As Sven Greving wrote. But it is good research practice to explore the internal consistency of the instruments in your own sample.
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