Explain how the upward trend on the scatterplot demonstrates the concept of a positive relationship. In your explanation, describe how stress scores and physical symptoms relate to each other in this scenario and explain what 'moving in the same direction' means for these two variables.
Case context: A student in an introductory psychology lab is analyzing a scatterplot that displays hypothetical data representing the relationship between stress levels and physical symptoms. The student notices that the data points follow an upward-trending slope. The student is asked to explain what this pattern means to a peer who has not taken a research methods course.
Question: Explain how the upward trend on the scatterplot demonstrates the concept of a positive relationship. In your explanation, describe how stress scores and physical symptoms relate to each other in this scenario and explain what 'moving in the same direction' means for these two variables.
Sample answer: The upward trend on the scatterplot indicates that as an individual's stress score increases, their frequency of physical symptoms also tends to increase. This shows that the two variables move in the same direction, which is the defining characteristic of a positive correlation. This means that higher stress is associated with more physical symptoms, and lower stress would correspond to fewer symptoms.
Key points:
- Explain that the upward pattern indicates both variables increase together.
- Describe the relationship as stress scores and physical symptoms changing in the same direction.
- Demonstrate comprehension of a positive relationship by linking the trend to the definition of a positive correlation.
Rubric: The response should demonstrate comprehension by explaining that the upward slope represents variables moving in the same direction. The student must specify that an increase in stress scores is associated with an increase in physical symptoms.
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Research Methods in Psychology - 4th American Edition @ KPU
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