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...Background t tests samples vs populations descriptive inferential william sealy gosset student distributions probabilities and p values assumptions of the probability that observed result was obtained by chance i e when null hypothesis is true level set a priori usually if then we reject accept experimental certain our effect genuine however research example there different activation ffg for faces objects within subjects design condition presented with face stimuli object hypotheses h no difference in during ha significant results how to compare mean bold signal change facial great but do know this not just fluke response between conditions brain b these groups alternative are taken from same population they should have fairly similar means statistically likely be drawn really...