How does the inclusion of a control group help negate the


1. How does the inclusion of a control group help negate the potential threats that exist to the internal validity of an experiment?

2. A researcher is interested in finding out whether keeping live flowers at home affects scores on a hope scale. She divides participants into a flowers group and a no-flowers group, and she considers matching the participants in both groups based on race. Should she go ahead with the matching process? Why or why not?

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Biology: How does the inclusion of a control group help negate the
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