can a pre- and post test be used together can we use the same random sample for pre and post testing? can i test the same sample in both a pre and post sample can you test different groups of individuals in a pre and post test can you test different groups of students for pre and post test can two randomised samples be used for same intervention? can an intervention test include different sampling methods? can you use different sampling in pre and post what can be tested in both post and pretest can the same sample be used in post intervention testing can you test different populations for pre and post tests can two sample tests be used in a pre and post-test which sample can be used in both post and pre test data can pre and post tests be the same can one test pre and post can pretests be used for different sampling procedures can you test the same random sample in both pre- and post-tests can you use the same random sample in a pre- and post test can pre and post tests use the same sample? which sample is tested on a pre and post test