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Error Bars
Error bars are smaller vertical lines extending upward and downward from the top of each main bar or point in a graph. They visually represent the variability within each group or condition, typically depicting one standard error or one standard deviation in each direction.
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Research Methods in Psychology - 4th American Edition @ KPU
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Error Bars
Example of a Bar Graph: Clinician Rating of Severity
Example of an APA-Style Bar Graph
According to standard research conventions, what type of independent variable is typically plotted on the x-axis when using a bar graph to present and compare mean scores?
A researcher wants to visually compare the mean anxiety scores among three distinct treatment groups. According to standard research conventions, a bar graph would be an appropriate way to present this data.