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**Unformatted text preview: **- 2 -Case 3: σ x 2 ≠σ Y 2 are unknown W= m S n S Y X Y X Y X / / ) ( 2 2 +---μ Welch’s approximation W ~ t(r) where 2 2 2 2 2 2 2 1 1 1 1 -+ - + = m s m n s n m s n s r Y X Y X Ping Ma Lecture 28 Fall 2005- 3 -Case 4: confidence interval for paired data Let (X1, Y2), (X2,Y2), …, (Xn, Yn) be n pairs of dependent measurements. Let Di=Xi-Yi, μ D = μ x-μ Y n S D D D / μ-Ping Ma Lecture 28 Fall 2005- 4 -...

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