In the formula, S2difference = S2M1 + S2M2, the "S2M1" is
A) the estimated mean of the distribution of variances of Population 1.
B) the variance of the difference scores for Population 1.
C) the estimated variance of Population 1.
D) the variance of the distribution of means for Population 1.
D
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When a researcher asks the question, "Was the subject dropout rate during the course of the study equal over the various conditions or more pronounced in certain treatment groups?", she is concerned with which one of the following potential confounds
a. regression b. random error c. mortality d. events outside the laboratory (history)
Pitch perception takes two processes: place theory and frequency theory
Indicate whether the statement is true or false
Which schedule of reinforcement reinforces the first correct response after a constant interval of time has elapsed?
a. fixed ratio b. variable ratio c. fixed interval d. variable interval
The dependent variable is often revealed by measures of performance, such as test scores
Indicate whether this statement is true or false