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Assumptions for a 2-Sample Test when n is small, Ï = ? ______________________________________ 1) The underlying populations must be normal ï· 2) Population variances (Ï) must be equal ï· Because I said soâ¦ ï· Apples and oranges 3) Samples must be drawn randomly. Pooled estimate of variance: s 2 p ïï¨n ï½ ï 1ï©s ï ï« ïï¨n ï 1ï©s n ï«n ï2 2 1 1 2 1 2 OR s ï½ 2 p SS ï« SS df ï« df 1 1 2 2 Standard Error: sM 1 ïM 2 ï½ s 2p n1 ï« s 2p n2 2 2 ï
