Based on the concept of establishing validity via a correlation matrix, explain how the researchers should interpret the pattern of correlations. Specifically, describe what pattern of correlations with GPA, test anxiety, and socially desirable responding would support the validity of their new Academic Motivation scale and explain why.
Case context: A team of developmental psychologists has constructed a new scale to measure 'Academic Motivation' in high school students. Following the methodology of Cacioppo and Petty, the researchers administer their new scale to a large sample of students along with measures for three established constructs: academic achievement (measured by GPA), test anxiety, and socially desirable responding. They compile these results into a Pearson's correlation matrix to evaluate the construct validity of their scale.
Question: Based on the concept of establishing validity via a correlation matrix, explain how the researchers should interpret the pattern of correlations. Specifically, describe what pattern of correlations with GPA, test anxiety, and socially desirable responding would support the validity of their new Academic Motivation scale and explain why.
Sample answer: To support the validity of the new Academic Motivation scale, the observed correlations in the matrix must align with theoretical predictions. The researchers should expect a moderate to strong positive correlation with GPA (since motivated students should achieve more), a negative correlation with test anxiety (since high anxiety may interfere with or show a different construct than pure motivation), and a very low or near-zero correlation with socially desirable responding. A low correlation with socially desirable responding is critical because it demonstrates that the scale is measuring actual motivation rather than just the students' tendency to present themselves in an appropriate or favorable light.
Key points:
- Comparing the pattern of correlations (Pearson's ) to theoretical expectations
- Predicting a positive correlation with GPA
- Predicting a negative correlation with test anxiety
- Predicting a low/near-zero correlation with socially desirable responding to demonstrate discriminant validity
Rubric: Grading criteria: 1. The response must state that validity is demonstrated by matching the observed correlation pattern to theoretical predictions. 2. The student must correctly identify expected directions: positive correlation with GPA, negative correlation with test anxiety, and low/near-zero correlation with socially desirable responding. 3. The student must explain that a low correlation with socially desirable responding is necessary to rule out bias/faking.
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Research Methods in Psychology - 4th American Edition @ KPU
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