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An investigator rates severity of a muscle condition using visual inspection of muscle biopsies
between 1 (normal), 2 (mild), 3(moderate), and 4 (severe). She wants to compare between two
groups: 14 subjects treated with a new drug, and 12 subjects treated with a placebo. Which test
should she use?
a. Mann-Whitney U test
b. Two-independent sample t-test for means
c. t-test for paired samples

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