2 tailed t-test or 1-tailed?

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2 tailed t-test or 1-tailed?

Postby lhone » Thu Jul 14, 2016 1:52 pm


I'm completely new to using SPSS, I am a teacher carrying out educational research as part of my masters qualification.
I am comparing pupils test scores before and after an intervention.
I have carried out a paired sampled t-test on the pre-test score (mean score %) and post-test score (mean score %).

When interpreting the significance level should I be using the 2-tailed value on the SPSS output or should I be converting this to a 1-tailed significance level?

Thank for any help!

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