Data Collectionhard
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A researcher designs an experiment to test whether a new teaching method increases test scores. Two classes are used: Class A (new method) and Class B (traditional method). The researcher notices that Class A has higher-performing students on average. To account for this confounding variable, the researcher should:
A researcher designs an experiment to test whether a new teaching method increases test scores. Two classes are used: Class A (new method) and Class B (traditional method). The researcher notices that Class A has higher-performing students on average. To account for this confounding variable, the researcher should: