The need to balance practice effects in the repeated measures design is analogous to the need to balance ________ in the independent groups design.
A) order effects
B) reactivity
C) individual differences
D) subject loss

Question

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In an independent groups design, participants are randomly assigned to different groups, each receiving a different level of the independent variable. The main concern here is to ensure that any differences observed between groups are due to the manipulation of the independent variable and not due to pre-existing differences between the participants in each group. Balancing individual differences across groups helps to ensure that the groups are equivalent at the start of the experiment, making it more likely that any observed differences in outcomes are due to the experimental manipulation rather than pre-existing differences among participants. This is analogous to balancing practice effects in repeated measures designs, where the same participants are exposed to all conditions, and the concern is that their performance may improve simply due to practice rather than the experimental manipulation.

The Need to Balance Practice Effects in the Repeated Measures