discussion 350 word min and a journal entry

For this Discussion, you will concentrate on the changing criterion design. Discuss the internal and external validity associated with the changing criterion design to include the experimental control logic for the design. Include the advantages and limitation of the research design as well. Following the procedural guidelines outlined in the Ledford & Gast (2019) text, provide a description and rationale of how you could apply the changing criterion design to the target behavior and intervention you identified in Unit 5.

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information needed from unit 5:

The hypothetical situation is the testing for a vaccine. A malaria vaccine has been developed to help address the prevalence of malaria in developing nations. The A-B-A-B study design may be used to determine whether or not the vaccine is likely to be effective in addressing the problem in the region. The vaccine could be introduced to the selected population and its impacts tested. It would be withdrawn to determine the possible effects and then finally reintroduced if it is found to be effective or impactful.


For this journal topic you will write a paragraph summarizing how the Changing Criterion Design shows experimental control. Make sure to elaborate on the concepts of prediction, verification, and replication.

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