Question

With reference to an example, briefly describe the four components of the reversal replication design.

a) Baseline, treatment, reversal, control.
b) Introduction, intervention, withdrawal, placebo.
c) A, B, C, D phases.
d) Experimental, observational, longitudinal, cross-sectional.

Answer 1

The reversal replication design involves four phases: Baseline, Treatment, Reversal, and Control. An example of this design could be a study of a new teaching method's effect on student test scores, examining the scores before and after the method is implemented, and comparing results with a control group.

Step-by-step explanation:

The reversal replication design, often used in experimental research, is characterized by four distinct phases:

• Baseline (A phase) - During the baseline phase, data is collected to assess the subject's behavior or condition before the introduction of any treatment or intervention.
• Treatment (B phase) - The treatment phase introduces the intervention or treatment that is being tested. This phase observes the effects of the treatment on the subject.
• Reversal (A phase) - The reversal phase involves the withdrawal of the treatment to determine if the observed effects are reversed, providing evidence that the treatment caused the changes.
• Control - A control condition is included within the design to ensure that the effects observed can be attributed to the treatment rather than other extraneous factors.

For example, to study the effect of a new teaching method on student test scores, a study might begin by measuring test scores without the new method (baseline), then implement the new teaching method (treatment), follow up by returning to the old method (reversal), and compare the results with a control group not exposed to the new teaching method (control).