This problem occurs when the groups become different after the experiment begins because more participants drop out of one of the groups than out of the other(s) for various reasons.

A. selection bias
B. maturation
C. regression
D. differential attrition


D. differential attrition

Political Science

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Which is a key difference between the Virginia Plan and the New Jersey Plan?

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Which one of the following is true of the U.S. Supreme Court's jurisdiction?

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A party leader or elected official who gets to vote at a party's national convention is known as a(n)

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If you, as a public figure, are grievously harmed by the written statements of someone who cannot prove that they are true, you

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Political Science