Inclusion of a control group spreads the attrition (on average) across the groups and allows the researcher to make group comparisons to test the effect of the independent variable.
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Q45: Effects of history (and other sources of
Q46: Many applied studies that examine realistic behaviors
Q47: Explain why quasi-experiments are not as useful
Q48: Explain how time-series designs are different from
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Q51: The researcher compares the scores from the
Q52: Attrition results in data being deleted from
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