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Based on this research design, explain why a bar graph is the appropriate visual representation for these results, referencing the nature of the independent variable and the specific statistics being compared.
Case context: A psychologist is conducting an experiment to investigate the effects of three distinct study conditions (studying in silence, studying with classical music, or studying with white noise) on students' test performance. The psychologist plans to calculate the average test score for each of the three groups and present the findings visually. The independent variable is the study condition, and the dependent variable is the test score.
Question: Based on this research design, explain why a bar graph is the appropriate visual representation for these results, referencing the nature of the independent variable and the specific statistics being compared.
Sample answer: A bar graph is the appropriate choice because the independent variable (study condition: silence, classical music, or white noise) plotted on the -axis is categorical. Furthermore, the goal is to present and compare the mean (average) test scores across these three groups, which aligns with the convention of using bar graphs to compare mean scores for different conditions.
Key points:
- The independent variable (study conditions) is categorical.
- Categorical variables are conventionally plotted on the -axis of a bar graph.
- A bar graph is used to present and compare the mean scores across the groups.
Rubric: The response must explain that the independent variable is categorical and therefore plotted on the -axis, and that the graph is used to compare the mean scores of the different study conditions.
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Research Methods in Psychology - 4th American Edition @ KPU
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