Unformatted text preview: mean difference score equals zero. Therefore, we use the formula for a single
sample t, with µ0 = 0. t= M diff
sdiff (2) n It’s important to keep in mind that everything in this formula is based on the difference scores, Xdiff. That is, Mdiff is the mean of Xdiff, sdiff is the sample standard deviation of Xdiff, and n is the number of difference scores (not the total number of observations; that’s 2n). Mean Square for independent
samples t
test. Like a single
sample t
test, the independent
samples t
test requires an estimate of the population variance, σ2. We could estimate σ2 using either sample by itself, i.e. u...
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This document was uploaded on 02/25/2014 for the course PSYC 3101 at Colorado.
 Spring '08
 MARTICHUSKI
 Psychology

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