Short Answer

A researcher conducts a single-subject study where the baseline measurements for study duration are 1010, 1515, and 1212 minutes, and the treatment measurements are 1414, 1818, and 2020 minutes. Applying the calculation method from the Robbie study time example, calculate the PND and state whether this indicates a 100% treatment effect.

Question: A researcher conducts a single-subject study where the baseline measurements for study duration are 1010, 1515, and 1212 minutes, and the treatment measurements are 1414, 1818, and 2020 minutes. Applying the calculation method from the Robbie study time example, calculate the PND and state whether this indicates a 100% treatment effect.

Sample answer: The highest baseline measurement is 1515 minutes. Comparing the treatment measurements (1414, 1818, and 2020 minutes) to this maximum, only 1818 and 2020 are strictly greater than 1515, while 1414 is not. Therefore, the PND is 2/32/3 or approximately 66.7%66.7\%, which is not sufficient to indicate a 100% treatment effect.

Key points:

  • The highest baseline measurement is identified as 1515 minutes.
  • Only 1818 and 2020 minutes exceed the baseline maximum of 1515 minutes.
  • The PND is calculated to be 66.7%66.7\% (or 2/32/3).
  • Conclude that the treatment effect is not 100%.

Rubric: Full credit is awarded if the student identifies 1515 minutes as the highest baseline measurement, shows that only two of the three treatment measurements (1818 and 2020) are greater than 1515, calculates the PND as 66.7%66.7\% (or 2/32/3), and correctly concludes that this does not indicate a 100% treatment effect.

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Updated 2026-05-27

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Research Methods in Psychology - 4th American Edition @ KPU

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