Case Study

Explain how Kanner and colleagues' conclusion that a genuine relationship exists in the overall population differs from simply reporting the sample correlation of +.60+.60. What does this distinction illustrate about the purpose of inferential statistics in psychological research?

Case context: A research student replicates Kanner's study on daily hassles and stress symptoms with a new sample of 80 participants and finds a positive correlation of +.52+.52 in their sample. The student is unsure if this result allows them to make a claim about the broader population or if it only describes their sample.

Question: Explain how Kanner and colleagues' conclusion that a genuine relationship exists in the overall population differs from simply reporting the sample correlation of +.60+.60. What does this distinction illustrate about the purpose of inferential statistics in psychological research?

Sample answer: Reporting the sample correlation of +.60+.60 only describes the relationship within the specific group of participants studied. In contrast, Kanner's conclusion that a genuine relationship exists in the overall population is an inference that extends beyond the sample. This distinction illustrates that the purpose of inferential statistics is to allow researchers to make generalizations about a larger population based on observed sample data.

Key points:

  • Distinguish between sample-specific results and population-level generalizations.
  • Understand that Kanner's sample correlation is +.60+.60.
  • Recognize that the population conclusion is an inference.
  • Explain that inferential statistics aim to generalize from a sample to a population.

Rubric: The student must explain the difference between describing a sample statistic and inferring a population relationship, and connect this to the role of inferential statistics.

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Updated 2026-05-27

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Research Methods in Psychology - 4th American Edition @ KPU

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