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Based on the two basic forms of statistical relationships in psychological research, explain how the two parts of the psychologist's study represent different forms of statistical relationships, and explain the role of descriptive statistics in this scenario.
Case context: A psychologist is investigating the relationship between students' study habits and their exam performance. In one part of the study, she compares the average exam scores of students who attended a study seminar versus those who did not. In another part of the study, she looks at the correlation between the number of hours students spent studying and their exact exam scores.
Question: Based on the two basic forms of statistical relationships in psychological research, explain how the two parts of the psychologist's study represent different forms of statistical relationships, and explain the role of descriptive statistics in this scenario.
Sample answer: The first part of the study compares the average exam scores of seminar attendees versus non-attendees, which represents the first form of statistical relationship: differences between distinct groups or conditions. The second part of the study examines the correlation between hours spent studying and exact exam scores, representing the second form: correlations between quantitative variables. In both parts, the psychologist would use descriptive statistics to summarize, examine, and communicate the details of these relationships (such as calculating group means or the correlation coefficient).
Key points:
- Identify group differences in the seminar comparison as 'differences between distinct groups or conditions'.
- Identify correlation in the hours/scores comparison as 'correlations between quantitative variables'.
- Explain how descriptive statistics are used to examine these relationships.
- Explain how descriptive statistics are used to communicate these relationships in greater detail.
Rubric: The student must correctly match the first part of the study to 'differences between distinct groups or conditions' and the second part of the study to 'correlations between quantitative variables'. Additionally, they must explain that descriptive statistics are used to examine and communicate these specific relationships.
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Research Methods in Psychology - 4th American Edition @ KPU
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