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A good experiment must include: A. Groups that differ only in the hypothesized casual factor(s) B....

A good experiment must include:

A. Groups that differ only in the hypothesized casual factor(s)

B. At least one group that includes a potentially confounding factor.

C. At least one group that differs from the control in multiple ways.

D. Groups that allow for many comparisons, including those not directly related to the hypothesis.

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A. Groups that differ only in the hypothesized casual factor(s)

A good experiment must include groups that differ only in hypothesized casual factors. A good experiment should not include confounding factors because they influence both the dependent and independent variables. For proper results, one comparison should be performed at a time not multiple comparisons.

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