Question: Show that the pooled standard error [SE pooled (Ym - Y)] given following Equation (3.23) equals the usual standard error for the difference in means

Show that the pooled standard error [SE pooled (Ym - Y)] 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 (n,, = n..). 

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