Question: 3.21 Show that the pooled standard error 3SEpooled( Ym - Yw)4 given following Equation (3.23) equals the usual standard error for the difference in means

3.21 Show that the pooled standard error 3SEpooled( Ym - Yw)4 given following Equation (3.23) equals the usual standard error for the difference in means in Equation (3.19) when the two group sizes are the same

(nm = nw).

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