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A bar graph begins its vertical axis at ninety instead of zero. Why may a small difference between two values appear very large?

Answer and explanation

Correct answer: A truncated scale exaggerates the difference

The governing concept is honest data visualisation. When a vertical axis starts at 90 rather than 0, the graph displays only a narrow portion of the full value range. A difference such as 92 versus 96 occupies a large share of that shortened visual scale, so the bars can look far apart even though the numerical difference is small. Thus option A is correct; colours, titles and the horizontal axis do not change the data values.

Related tags

Bar GraphTruncated ScaleData VisualisationMisleading GraphData Interpretation And Basic VisualizationData LiteracyArtificial IntelligenceClass 9 Mcq

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