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A researcher conducts a single-subject study and calculates a Percentage of Non-Overlapping Data (PND) of . The researcher concludes that this metric indicates a highly successful and strong treatment effect. In one to three sentences, evaluate the validity of the researcher's conclusion based on the principles of PND.
Question: A researcher conducts a single-subject study and calculates a Percentage of Non-Overlapping Data (PND) of . The researcher concludes that this metric indicates a highly successful and strong treatment effect. In one to three sentences, evaluate the validity of the researcher's conclusion based on the principles of PND.
Sample answer: The researcher's conclusion is invalid. A PND of means that only a small fraction of the treatment data is more extreme than the control data, which actually indicates a very weak treatment effect, since a greater percentage is required to show a stronger effect.
Key points:
- States that the researcher's conclusion is invalid or incorrect.
- Explains that is a low percentage of non-overlapping data.
- Clarifies that a greater PND is required to indicate a stronger treatment effect.
Rubric: Award full points if the student correctly identifies the conclusion as invalid and justifies it by explaining that a low PND indicates a weak treatment effect, not a strong one.
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Research Methods in Psychology - 4th American Edition @ KPU
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A researcher conducts a single-subject study and calculates a Percentage of Non-Overlapping Data (PND) of . The researcher concludes that this metric indicates a highly successful and strong treatment effect. In one to three sentences, evaluate the validity of the researcher's conclusion based on the principles of PND.