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Working with Paired Data

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An investigator wants to test if the mean pain score (a higher score indicates

more self-reported pain) is less after participants have undergone a new

proceedure.  Twenty participants had their pain score recorded prior to

treatment and immediately after treatment.  What might be a reasonble test

statistic to test for a signficant change in mean pain score? Why?

a) Independent Sample T-test (Student t-test)

b) Paired t-test

c) Chi-square test for independence

d) Goodness-of-fit Chi-square test