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A study showed average improvement but half the participants became worse. Why is a conclusion based only on the average incomplete?

Answer and explanation

Correct answer: The average can hide individual outcomes and the spread of data

An average summarises the whole group in one number, so it can conceal the fact that some participants improved greatly while others became worse. Here, the worsening of half the participants shows that individual results, data spread, and subgroup patterns must also be examined. Option C is incorrect because an improved average does not mean that every individual improved. Exam tip: Along with the average, check the range, distribution, and results for different groups.

Related tags

AverageIndividual VariationData DistributionScientific InquiryInterpreting DataNature And Meaning Of ScienceExploration: Entering The World Of Secondary ScienceExploration Entering The World Of Secondary Science

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