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Based on the concept of a planned analysis, explain why the psychologist's calculation of Cohen's qualifies as a planned analysis in this scenario.
Case context: A developmental psychologist sets up a study with the original hypothesis that toddlers who attend preschool will score higher on a standardized vocabulary test than those who stay at home. After collecting the data, the psychologist computes the group means, standard deviations, and a Cohen's to specifically evaluate this anticipated difference.
Question: Based on the concept of a planned analysis, explain why the psychologist's calculation of Cohen's qualifies as a planned analysis in this scenario.
Sample answer: The calculation of Cohen's qualifies as a planned analysis because the psychologist is conducting a statistical test to evaluate a specific difference between two conditions—preschool attendees scoring higher than non-attendees—that was explicitly expected in their original hypothesis prior to analyzing the data.
Key points:
- The calculation of Cohen's tests an expected difference between the two toddler groups.
- The difference between groups was explicitly predicted in the original hypothesis.
- The analysis evaluates a pre-specified relationship rather than exploring unexpected findings.
Rubric: The response must explicitly connect the statistical test (Cohen's ) to the original hypothesis established before data collection, demonstrating an understanding that planned analyses test explicitly anticipated relationships or differences.
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Research Methods in Psychology - 4th American Edition @ KPU
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Planned Analysis Example
Which of the following best describes a planned analysis in psychological research?
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In psychological research, a statistical test conducted to evaluate a specific relationship or difference that was expected in the researcher's original hypothesis is known as a(n) ________ analysis.
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Based on the concept of a planned analysis, explain why the psychologist's calculation of Cohen's qualifies as a planned analysis in this scenario.
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