Question: What is the difference between these two equations? Both are used when hypothesis testing. When would you use one v.s. the other? What does ?

What is the difference between these two equations? Both are used

What is the difference between these two equations? Both are used when hypothesis testing.

When would you use one v.s. the other?

What does ?D0?? mean?

?D0?? mean? Do for some fixed value Do, it follows that, if

Do for some fixed value Do, it follows that, if Ho is tr Y1 - Y2 - Do T = Sp n1 n2 tribution with nj + n2 - 2 df. Notice that this small-sHo: M1 - M2 = Do (where Do is some fixed value) versus any alternative, the test statistic is given by ( Y1 - Y2) - Do Z = + n1 n2

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