Participants for a Treatment Group Are Chosen Because They Score

question 43

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) should consider the possibility that statistical regression influenced posttest scores.
• B) can rule out testing and instrumentation threats to internal validity.
• C) can be confident that the treatment was effective.
• D) must conclude that additive effects with selection are responsible for the outcome.