What are the three essential properties of a well-designed experiment?
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Q30: Contrast simple random assignment with matched random
Q31: A "perfect" experiment maximizes _ variance and
Q32: In the analogy comparing variance to the
Q33: Differential attrition decreases internal validity because
A)the independent
Q34: Which of the following contribute to error
Q36: Biased assignment
A)increases error variance.
B)is a particular problem
Q37: Error variance must be minimized in an
Q38: Demand characteristics are
A)the experimenter's expectancies about what
Q39: In experimental research, researchers regard _ as
Q40: Variance in participants' scores that is not
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