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Describe the key characteristics of a one-group pretest-posttest design and explain why the order of conditions cannot be counterbalanced in this specific design.
Question: Describe the key characteristics of a one-group pretest-posttest design and explain why the order of conditions cannot be counterbalanced in this specific design.
Sample answer: A one-group pretest-posttest design is a quasi-experimental method where a single group of participants is measured on a dependent variable before a treatment (the pretest) and again after the treatment (the posttest). The order of conditions cannot be counterbalanced because the treatment must naturally occur between the initial baseline measurement and the subsequent follow-up measurement, making it impossible for participants to experience the treatment condition before the untreated baseline condition.
Key points:
- It is a quasi-experimental research method.
- A single group is measured on a dependent variable before the treatment to establish a baseline (pretest).
- The same group is measured on the dependent variable again after the treatment (posttest).
- Counterbalancing is impossible because the treatment must inherently occur between the initial measurement and the subsequent measurement.
Rubric: The essay should accurately define the design as involving one single group measured before and after a treatment. It must clearly state that counterbalancing is impossible because the pretest must logically precede the treatment and posttest.
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Research Methods in Psychology - 4th American Edition @ KPU
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Example of a One-Group Pretest-Posttest Design
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