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You are designing an APA-style bar graph to compare mean scores across categorical conditions. If the standard error for Group A is 2.5 and for Group B is 4.0, how should you construct the error bars for these groups, and what will they allow a reader to do when viewing your graph?
Question: You are designing an APA-style bar graph to compare mean scores across categorical conditions. If the standard error for Group A is 2.5 and for Group B is 4.0, how should you construct the error bars for these groups, and what will they allow a reader to do when viewing your graph?
Sample answer: You should add error bars to the top of each main bar, extending the error bar for Group A exactly 2.5 units upward and downward, and the error bar for Group B exactly 4.0 units upward and downward. These constructed error bars will allow a reader to observe the variability within each group and visually estimate whether the difference between the mean scores of Group A and Group B is statistically significant.
Key points:
- Extend the error bar for Group A one standard error (2.5 units) upward and downward from the top of its main bar.
- Extend the error bar for Group B one standard error (4.0 units) upward and downward from the top of its main bar.
- Identify that this construction allows readers to observe within-group variability.
- Identify that this allows readers to visually estimate the statistical significance of differences between the group means.
Rubric: The answer must specify constructing error bars that extend one standard error (2.5 units for Group A, 4.0 units for Group B) upward and downward from the top of each main bar, and state that this allows readers to observe group variability and estimate the statistical significance of differences between means.
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Research Methods in Psychology - 4th American Edition @ KPU
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