Case Study

Based on the provided context of Jerry Burger's study, explain how a researcher can justify stopping a replication earlier than the original study's maximum threshold. Specifically, what empirical pattern in historical data allows for a valid comparison of obedience rates while reducing participant risk?

Case context: Imagine you are an ethics board member reviewing a proposal to replicate a controversial historical study on obedience. The original study allowed participants to administer what they believed were increasingly painful electric shocks up to a 450450-volt maximum, causing extreme distress. The applicant proposes replicating this study but stopping the experiment at 150150 volts, citing Jerry Burger's 20092009 design modification.

Question: Based on the provided context of Jerry Burger's study, explain how a researcher can justify stopping a replication earlier than the original study's maximum threshold. Specifically, what empirical pattern in historical data allows for a valid comparison of obedience rates while reducing participant risk?

Sample answer: A researcher can justify stopping the replication early because historical data shows that participants who reached the 150150-volt shock typically continued all the way to the 450450-volt maximum. By stopping the procedure at 150150 volts, the researcher can validly compare obedience rates and estimate how many participants would have continued to the maximum, while successfully avoiding the severe psychological stress that participants experienced at higher voltage levels.

Key points:

  • Explains that past data showed participants reaching 150150 volts typically continued to the 450450-volt maximum.
  • Describes how this allows the researcher to compare obedience rates and estimate final obedience without administering higher shocks.
  • Connects the stopping point directly to minimizing harm and reducing severe psychological stress.

Rubric: The answer must demonstrate comprehension of the relationship between the 150150-volt threshold and the 450450-volt maximum. It must explain that reaching 150150 volts predicts completion to the maximum, and that stopping at this point allows for valid comparison and estimation of obedience rates while protecting participants from the severe stress of higher voltages.

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Updated 2026-05-26

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Research Methods in Psychology - 4th American Edition @ KPU

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