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A graph shows two different units on the same vertical axis without explanation. What is the main problem?

Answer and explanation

Correct answer: Comparison of values may become meaningless or confusing

The governing concept is truthful graph labelling. Values measured in different units cannot be compared directly unless the axes, scales, or conversion are clearly explained. Putting both units on one unexplained vertical axis can make one trend appear larger or smaller for the wrong reason, so option C is correct. Line shape, colour variety, and time order do not solve the unit ambiguity.

Related tags

Graph UnitsAxis LabellingData InterpretationVisual CommunicationCommunication Skills IArtificial IntelligenceClass 9 Mcq

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