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Explain how the complete counterbalancing technique controls for order effects in within-subjects designs, and describe the logistical challenge that arises when using this technique as the number of experimental conditions increases.
Question: Explain how the complete counterbalancing technique controls for order effects in within-subjects designs, and describe the logistical challenge that arises when using this technique as the number of experimental conditions increases.
Sample answer: Complete counterbalancing controls for order effects by ensuring that an equal number of participants complete every possible unique sequence of experimental conditions. This design neutralizes sequence as a confounding variable. Participants are randomly assigned to the various sequence orders. However, as the number of experimental conditions increases, the total number of required orders grows factorially. This means the required sample size must scale rapidly to ensure that every unique sequence has an equal number of participants, which can become logistically difficult or impossible for studies with many conditions.
Key points:
- Complete counterbalancing involves having an equal number of participants complete every possible unique order of conditions.
- The method works by neutralizing sequence as a confounding variable.
- Participants must be randomly assigned to the different sequences.
- The total number of required sequences grows factorially as the number of conditions increases, creating a challenge for large numbers of conditions.
Rubric: To receive full credit, the response must identify that complete counterbalancing requires an equal number of participants to complete every possible sequence, mention that participants are randomly assigned to these sequences, and explain that the main limitation is the factorial growth of required sequences (and thus sample size) as conditions increase.
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Research Methods in Psychology - 4th American Edition @ KPU
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