Example of a Pretest-Posttest Design with Switching Replication
An illustrative example of a pretest-posttest design with switching replication involves testing an exercise program for depression on two nonequivalent groups: clinical patients and university students. Initially, baseline depression scores are recorded for everyone. The patients then engage in the exercise routine while the students wait, and a second measurement is taken; if effective, only the patients' depression should decrease at this stage. Afterward, the students also begin the exercise program while the patients maintain it. A final assessment should then demonstrate a reduction in the students' depression, confirming the intervention's efficacy across two distinct populations.
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Research Methods in Psychology - 4th American Edition @ KPU
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Switching Replication with Treatment Removal Design
Arrange the procedural steps of a pretest-posttest design with switching replication in the correct chronological order.
Which of the following best describes the defining procedural feature of a pretest-posttest design with switching replication?
A researcher is using a pretest-posttest design with switching replication to evaluate a new stress-management technique in two different hospital departments. After both departments complete a baseline measurement, Department A receives the technique first, while Department B serves as the control. Later, the technique is introduced to Department B. True or False: To support the claim that the technique is effective, the researcher should expect Department B’s stress levels to remain relatively stable until they actually begin the technique.
A psychology researcher uses a pretest-posttest design with switching replication to evaluate a new stress-reduction technique with two groups of undergraduate students. Match each specific data observation from the study's timeline with the logical purpose it serves in analyzing the technique's effectiveness.
A researcher is designing a study to evaluate a new stress-management technique in two different corporate offices, Office and Office . To maximize the internal validity of the findings by assessing the technique's impact at two distinct time points and ensuring both groups eventually receive the intervention, the researcher must construct a staggered implementation plan. Which of the following blueprints represents the correct construction of a pretest-posttest design with switching replication?
In a pretest-posttest design with switching replication, the nonequivalent control group never receives the experimental intervention.
Match each measurement phase of a pretest-posttest design with switching replication to the primary purpose it serves in establishing the study's internal validity.
A psychology researcher employs a pretest-posttest design with switching replication to evaluate a memory-enhancement technique. While the first group demonstrates significant improvement after the intervention, the second group shows no such change when the intervention is introduced to them later. When evaluating the internal validity of the study, the researcher must conclude that the initial results in the first group were likely _____, as the effect failed to replicate under the staggered introduction.
In a study using a pretest-posttest design with switching replication, researchers evaluate a new reading software in two nonequivalent classrooms. Class 1 receives the software first, and Class 2 serves as the control. To analyze whether the software's effect replicates, the researcher compares Class 1's posttest improvement against Class 2's improvement at the _____ measurement.
A developmental psychologist wants to evaluate the efficacy of a socio-emotional intervention using a pretest-posttest design with switching replication. Order the research steps from first to last to show how the researcher sequentially evaluates the treatment's impact and replicates the findings.
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Example of a Switching Replication with Treatment Removal Design
Arrange the procedural steps of the pretest-posttest design with switching replication in the correct order, as illustrated by the study testing an exercise program for depression on clinical patients and university students.
In a study assessing an exercise program for depression, clinical patients receive the treatment first while university students serve as a waiting group. After the first post-intervention assessment, the university students then begin the same exercise program. What is the primary scientific purpose of having the university students start the program at a later stage in this specific design?
In a study assessing an exercise program for depression using a switching replication design, clinical patients receive the treatment first while university students serve as a waiting group. Later, the university students also begin the program while patients maintain it. Match each group and phase with the expected outcome if the intervention is effective.
In a switching replication study testing an exercise program for depression, if both the clinical patients (who are receiving the treatment) and the university students (who are currently waiting) show an identical decrease in depression at the same time, the researcher should conclude that the exercise program is the primary cause of the patients' improvement.
If you were tasked with building a research protocol to test an exercise program for depression using clinical patients and university students, which of the following experimental structures would you implement to ensure the treatment's effect is replicated across both populations by having each group eventually serve as a comparison for the other?
In the example of a pretest-posttest design with switching replication testing an exercise program for depression, the clinical patients and the university students begin the exercise routine simultaneously immediately following the baseline measurement.
In a research study where an exercise program for depression is first administered to clinical patients while university students wait, and then later administered to the university students, a researcher finds that both groups show significant improvement only after they begin the program. This pattern of results allows the researcher to evaluate the intervention's _____ as being high, because the treatment's efficacy has been confirmed across two distinct and nonequivalent populations at different points in time.
In a study testing an exercise program for depression, baseline depression scores are recorded for clinical patients and university students. The clinical patients then engage in the exercise routine while the university students wait. If the exercise program is effective, the second measurement (taken before the university students start the program) should show a decrease in depression scores for the _____ group, while the university students' scores remain unchanged.
In a pretest-posttest design with switching replication testing an exercise program for depression, each observation or design feature serves a specific inferential role in the study's internal logic. Match each observation or feature to the inferential function it performs.
A researcher has completed a pretest-posttest study with switching replication testing an exercise program for depression. To rigorously evaluate whether the results justify a causal conclusion, the researcher must work through a series of inferential judgments. Arrange these evaluative steps in the order that most logically builds toward a defensible causal claim.
Describe the procedural timeline of a pretest-posttest design with switching replication, detailing when treatments are administered and when measurements are taken for the clinical patients and university students in the exercise program example.
Explain why the researcher cannot confidently conclude that the exercise program is a universally effective, long-term intervention based on these findings. Diagnose the issue created by the clinical patients stopping the exercise program and justify your response using the design's replication logic.
Imagine you are applying the pretest-posttest design with switching replication to study the exercise program for depression. If you observe that both the clinical patients and the university students show a significant decrease in depression at the second measurement (before the students have started the exercise program), what does this indicate about the internal validity of your study and the actual cause of the patients' improvement?