(Solved): A two-sample test of means, with known, uses this test statistic:
z = x1x221n1+ ...
A two-sample test of means, with ? known, uses this test statistic:
z = x??1?x??2?21n1+?22n2?x¯1-x¯2?12n1+?22n2 Match the variables to their description.
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