Example of a Switching Replication with Treatment Removal Design
To illustrate a switching replication with treatment removal design, consider a study testing an exercise intervention on nonequivalent groups of depressed patients and depressed students. Researchers first measure baseline depression for both groups. Then, the patients begin the exercise program while the students do not. A second measurement should show decreased depression solely in the patient group. In the critical next phase, the treatment is removed from the patients (they stop exercising) and applied to the students (they start exercising). A final measurement should reveal that the students' depression levels have decreased, while the patients' depression levels have increased because they are no longer receiving the intervention.
0
1
Tags
KPU
Research Methods in Psychology - 4th American Edition @ KPU
Related
Example of a Switching Replication with Treatment Removal Design
Strengths of Treatment Removal in Switching Replication
What is the defining feature that distinguishes a switching replication with treatment removal design from a standard switching replication design?
Arrange the chronological phases of a switching replication with treatment removal design.
A social psychologist is studying the effect of a 'positive feedback' intervention on employee morale in two different departments of a company. They decide to use a switching replication with treatment removal design. Match each participant group and phase to their specific experience in this study.
In a switching replication with treatment removal design, if the first group's scores do not return to baseline levels after the treatment is withdrawn, the researcher can no longer use the 'removal' phase to effectively distinguish the treatment's effect from a maturation threat.
You are tasked with constructing a research protocol to evaluate the efficacy of a 'mindfulness training' intervention in two distinct hospital units. To utilize a switching replication with treatment removal design and maximize internal validity, which of the following procedural blueprints should you create to assess both the replication of the effect and its potential reversal?
In a switching replication with treatment removal design, the group that receives the treatment first continues to receive that intervention for the entire duration of the study.
A researcher concludes that a new social skills program is effective because students in the first group improved during the treatment phase. However, because the students' skills did not decline during the subsequent removal phase, a critic evaluating the study's internal validity would argue that the results could instead be explained by a(n) _____ threat.
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?
Learn After
Arrange the procedural steps of a switching replication with treatment removal design in the correct chronological order.
In a study testing the effects of exercise on depression, researchers have a group of patients participate in an exercise program while a group of students does not. Later, the patients stop the program while the students begin it. If the patients' depression scores increase after they stop exercising, what does this specific result help the researchers understand?
In a study testing an exercise intervention for depression using a switching replication with treatment removal design, match each group and phase with the expected outcome assuming the intervention is effective.
A researcher evaluates the results of a study using a switching replication with treatment removal design to test an exercise intervention for depression. They conclude that the evidence for the intervention's effectiveness is scientifically most robust if the first group maintains their improved mood even after they stop exercising, as this demonstrates the long-term stability of the treatment.
A research team is designing a study to test if a new 'sleep-hygiene' protocol improves daytime alertness in two separate hospital wards. They must construct a design that demonstrates the protocol is the direct cause of any improvement by showing that alertness levels improve only when the protocol is active, return to baseline when it is removed, and improve in a second group when it is subsequently introduced. Which of the following plans correctly synthesizes these requirements into a functional experimental protocol?
In the illustrative example of a switching replication with treatment removal design, the depressed patients' depression levels are expected to increase after the exercise program is removed from their routine.
In a study testing the effects of an exercise intervention on depression using two nonequivalent groups (depressed patients and depressed students), researchers implement a design where the treatment is switched between groups and removed. Arrange the events of this study in the correct chronological order from first to last.
In a switching replication with treatment removal design, Group A's symptoms return to baseline after the treatment ends, while Group B's symptoms simultaneously improve as they begin that treatment. This pattern allows researchers to rule out _____ because a coincidental external event would likely affect both groups in the same direction at the same time.
In the exercise-and-depression switching replication with treatment removal study, match each observation to the specific inferential function it serves in supporting a causal conclusion.
A research methods instructor asks students to judge the causal evidence produced by the exercise-and-depression switching replication with treatment removal study. The full dataset shows: patients' depression decreased in Phase 1 (when patients exercised and students did not); patients' depression increased in Phase 2 (after they stopped exercising); and students' depression decreased in Phase 2 (after they started exercising). Applying the design's evaluative criteria, a student should judge the overall causal evidence as _____, because every expected pattern was observed — including the critical reversal in the patient group that rules out alternative explanations such as maturation or spontaneous recovery.
State the three phases of measurement in a switching replication with treatment removal design using the example of the exercise intervention study. Describe which group receives the intervention and when, as well as the expected outcomes at each measurement point.
Explain the purpose of the treatment removal phase for the patient group in this design. How does the expected change in their depression levels after treatment removal help researchers demonstrate that the exercise intervention is the actual cause of the changes in depression?
In the exercise study, a researcher is transitioning from the first treatment phase to the switching replication phase. What specific actions must the researcher take regarding the daily routines of both the patient group and the student group to implement the 'switching replication with treatment removal' design?