Even When Pretest Scores Are the Same,on Average,for Treatment and Comparison

question 4

Multiple Choice

Even when pretest scores are the same,on average,for treatment and comparison groups in a nonequivalent control group design,the two groups may not be equivalent because

• A) the pretest measure is unlikely to be relevant to the dependent variable.
• B) the posttest measure is unlikely to be the same as the pretest measure, and the two groups must be equivalent at the posttest.
• C) the fact that the two groups are equal on the pretest measure does not ensure that the groups are equivalent on other characteristics relevant to the study.
• D) the natural growth rates of two groups from different populations are likely to be the same, but the pretest estimate of equality may still be in error.

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