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Explain why using a line graph in this scenario violates standard graphing conventions, and describe what type of graph should be used instead based on the nature of the independent variable.
Case context: A researcher conducts an experiment to evaluate the effect of three different therapy styles (Cognitive Behavioral Therapy, Psychodynamic Therapy, and Humanistic Therapy) on patient anxiety levels. To present the results, the researcher creates a line graph showing the average anxiety scores for each of the three therapy groups.
Question: Explain why using a line graph in this scenario violates standard graphing conventions, and describe what type of graph should be used instead based on the nature of the independent variable.
Sample answer: Using a line graph violates standard conventions because the independent variable (therapy style) is categorical, consisting of distinct, qualitative groups. The standard convention is to use a bar graph for categorical independent variables, whereas line graphs are reserved for quantitative or continuous independent variables. Therefore, a bar graph should have been used instead.
Key points:
- Identify that the independent variable (therapy style) is categorical.
- Explain that line graphs are conventionally reserved for quantitative or continuous independent variables.
- Identify that a bar graph should be used for categorical independent variables.
Rubric: The explanation must clearly state that the independent variable (therapy styles) is categorical. It must explain that line graphs are reserved for quantitative or continuous variables, making it inappropriate here. Finally, it must specify that a bar graph is the correct choice under standard conventions for categorical variables.
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Research Methods in Psychology - 4th American Edition @ KPU
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