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Explain why the psychologist's decision to use a line graph is appropriate based on the nature of their independent variable. Then, clarify what the vertical markings extending from each point represent and what specific statistical information they convey to the reader.
Case context: A cognitive psychologist is examining how practice affects reaction time. They measure reaction times (the dependent variable) at three distinct intervals: 1 hour, 2 hours, and 3 hours after initial training. They decide to present their results using an APA-style line graph, plotting the intervals on the -axis, representing average reaction times with points, and including vertical markings extending from each point.
Question: Explain why the psychologist's decision to use a line graph is appropriate based on the nature of their independent variable. Then, clarify what the vertical markings extending from each point represent and what specific statistical information they convey to the reader.
Sample answer: Using a line graph is appropriate because the independent variable (time in hours) is measured continuously. The vertical markings extending from each point represent error bars, and their purpose is to visualize standard error around each mean score of the dependent variable.
Key points:
- A line graph is appropriate because the independent variable (time) is continuous.
- The vertical markings are error bars.
- The error bars visualize standard error.
Rubric:
- Demonstrates comprehension by identifying that the independent variable (time) is continuous, justifying the choice of a line graph. 2. Identifies the vertical markings as error bars. 3. Comprehends that the error bars visualize the standard error of the mean scores.
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Research Methods in Psychology - 4th American Edition @ KPU
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