Which of the following are true of bar charts? (Not segmented bar charts.)

I. A bar chart is for quantitative data only.

II. Bar charts are effective for showing an association between two variables.

III. Bar charts are effective for showing differences between categories of a single variable

Question

Which of the following are true of bar charts?  (Not segmented bar charts.)

I.  A bar chart is for quantitative data only.

II. Bar charts are effective for showing an association between two variables.

III.  Bar charts are effective for showing differences between categories of a single variable

BlackTom AI · Accepted Answer

The question asks about statements true of bar charts (not segmented bar charts) and provides three statements to evaluate.
Statement I: 'A bar chart is for quantitative data only.' This is misleading. Bar charts are commonly used for categorical data (counts or frequencies per category), not exclusively quantitative data. In fact, bar charts visualize the size of categories rather than a quantitative scale for a continuous variable, so this claim is not correct.
Statement II: 'Bar charts are effective for showing an association between two variables.' For a single-variable bar chart, you are looking at differences across categories of one variable. To show association between two variables, you would typically use a different plot type (such as a scatter plot, mosaic plot, or grouped/stacked bar charts when appropriate). An unsegmented bar chart does not display an association between two variables, so this statement is incorrect.
Statement III: 'Bar charts are effective for showing differences between categories of a single variable.' This is precisely what a standard bar chart is designed to do: compare category sizes or frequencies across the categories of one nominal or ordinal variable. Therefore, this statement is correct.
Because the question’s answer indicates 'III only,' the correct assessment aligns with Statement III being true and Statements I and II being false. Note: in this analysis, I am assuming standard (unsegmented) bar charts as described in the prompt; if answer choices or wording differed, the evaluation could change accordingly.

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