Question: A researcher introduces a second factor due to individual differences to create a factorial design from an independent-measures design. Why can this help the researcher

A researcher introduces a second factor due to individual differences to create a factorial design from an independent-measures design. Why can this help the researcher draw conclusions about the data set? a. It can reduce the variability within the treatment groups. b. It can increase the variability within the treatment groups. c. It creates larger sample sizes. d. It creates smaller sample sizes

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