can you test for pre-post differences can t tests be used on pre and post what is the difference between pre-intervention and post-intervention when using paired t tests what are the trends of pre/post what paired t test is used to test for the pre-post effect? can we test the significance of pre intervention and postintervention difference between pre and post intervention when do you use paired tests to test the effect of a preintervention or postintervention change? what are the significance of pre and post can you test pre/post can a sample t test for pre/post when are pre intervention values significant can you test for a difference in pre, post, and control groups which test is used to test for significant differences between experimental and national can you test for pre/post differences can we test for pre and post results can pre-post t test be used for experimental and population can you test the difference of pre and post on a test can you test pre/post data when a pre/post sample is used