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### 8 Cards in this Set

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 SAMPLING DISTRIBUTION OF DIFFERENCES BETWEEN MEANS THE DISTRIBUTION OF THE DIFFERENCES BETWEEN MEANS OVER REPEATED SAMPLING FROM THE SAME POPULATIONS VARIANCE SUM LAW THE RULE GIVING THE VARIANCE OF THE SUM (OR DIFFERENCE) OF TWO OR MORE VARIABLES STANDARD ERROR OF DIFFERENCES BETWEEN MEANS THE STANDARD DEVIATION OF THE SAMPLING DISTRIBUTION OF THE DIFFERENCES BETWEEN MEANS HOMOGENEITY OF VARIANCE THE SITUATION IN WHICH TWO OR MORE POPULATIONS HAVE EQUAL VARIANCES WEIGHTED AVERAGE THE MEAN OF THE FORM (a1x1 + a2x2)/(a1 + a2), WHERE a1 AND a2 ARE WEIGHTING FACTORS AND x1 AND x2 ARE THE VALUES TO BE AVERAGED POOLED VARIANCE A WEIGHTED AVERAGE OF THE SEPARATE SAMPLE VARIANCES CONFOUNDED TWO VARIABLES ARE SAID TO BE CONFOUNDED WHEN THEY ARE VARIED SIMULTANEOUSLY AND THEIR EFFECTS CANNOT BE SEPERATED HETEROGENEITY OF VARIANCE A SITUATION IN WHICH SAMPLES ARE DRAWN FROM POPULATIONS HAVING DIFFERENT VARIANCES