Formula for difference score in pairedsamples design

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Unformatted text preview: XA, XB: The two scores, or samples, in a paired ­samples t ­test Xdiff: Difference score in a paired ­samples t ­test. Formula for difference score in paired ­samples design. When each subject (or event, etc.) has two scores on the same variable, we can compute a difference score by subtracting one from the other. Xdiff = X A ! X B (1) t statistic for paired samples. A paired ­samples t ­test works just like a single ­sample t ­test applied to the difference scores. The null hypothesis states µA = µB, which implies that the...
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