Lecture 10. Review Rank Sum test (Chapter 4.2) Welch t-test for comparing two normal populations with unequal spreads (Chapter 4.3.2) Practical and statistical significance (Chapter 4.5.1). Rank Sum Test Review.
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where mean(T) and SD(T) calculated under H0. p-value = 2*Prob(Z>|z|) where Z = standard normal r.v.