Explain why this student's conclusion is an overstatement based on the scientific process. What can and cannot be concluded from this replication attempt, and what does this illustrate about the progress of science?
Case context: A student in a research methods class reads about the Many Labs Replication Project's attempt to replicate the finding that handwashing reduces the perceived severity of moral transgressions. The student notes that the replication team used the same materials and identical procedures with a much larger sample, but could not reproduce the original results. The student concludes: 'This means we can now definitively conclude that the handwashing effect does not exist at all.'
Question: Explain why this student's conclusion is an overstatement based on the scientific process. What can and cannot be concluded from this replication attempt, and what does this illustrate about the progress of science?
Sample answer: The student's conclusion is an overstatement because science is cautious, and we cannot definitively conclude that the handwashing effect does not exist based on this failure to replicate. Instead, the replication failure suggests that the original finding was likely unreliable, possibly due to a small sample size. This case illustrates the self-correcting nature of science, showing that scientific progress is a collaborative, cautious process where rigorous testing corrects previous errors rather than delivering absolute finality.
Key points:
- We cannot definitively conclude that the handwashing effect does not exist.
- The failure to replicate suggests the original finding was likely unreliable.
- The original study's small sample size is a likely source of the unreliability.
- This project demonstrates the self-correcting, collaborative, and cautious nature of science.
Rubric: Students should identify that a failure to replicate does not definitively prove the non-existence of the effect. They must explain that the replication failure indicates unreliability (potentially due to sample size) and discuss how this illustrates the collaborative, cautious, and self-correcting nature of science.
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Research Methods in Psychology - 4th American Edition @ KPU
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In the Many Labs Replication Project, an international team of researchers successfully replicated the original finding that handwashing reduced the perceived severity of moral transgressions.
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Based on the provided text, describe the Many Labs Replication Project's attempt to replicate the handwashing study. Identify the original finding, the methods used for the replication, and the final outcome of the attempt.
Explain why this student's conclusion is an overstatement based on the scientific process. What can and cannot be concluded from this replication attempt, and what does this illustrate about the progress of science?
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