Multiple Choice
Participants for a treatment group are chosen because they score very low on a pretest measure of performance.When their performance improves on the posttest,the researcher
A) can be confident that the treatment was effective.
B) can rule out testing and instrumentation threats to internal validity.
C) should consider the possibility that statistical regression influenced posttest scores.
D) must conclude that additive effects with selection are responsible for the outcome.
Correct Answer:
Verified
Correct Answer:
Verified
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