![]() ![]() ![]() Pooled variance (S2p) S2p = (SS1 + SS2) / df1 + df2 Where, df1 = N1-1 and df2= N2-1 and SS1 and SS2 are given to you.Note – I’ll show you 2 approaches (you decide which to use based on what data is given to you)įinding Estimated Standard Error using SS (lab approach).Then standard error used in denom of T obs.so pool the sample variances to estimate pop variance.Assume the 2 populations have the same variance, but sample variance will differ….T observed will use concept of pooled variance to estimate standard error:.Ha = 1 - 2 not = 0 (2 tailed) or 1 - 2 > or |T crit| Reject Null.Ho: or 1 - 2 = 0 (no group difference) or 1 = 2.Distribution of differences between means. ![]()
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February 2023
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