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A scientific study reports only the average and hides individual values. Which important feature may remain unnoticed?

Answer and explanation

Correct answer: Subgroups or unusual variation in the data

The direct answer is A: subgroups or unusual variation in the data may remain unnoticed. An average is one summary number, found by adding values and dividing by their number, but it does not show every individual value. For example, two groups can have the same average even when one group has low values and the other has high values. Step by step: inspect the individual observations; look for clusters, extreme values, spread, or unequal subgroups; then compare these patterns with the average. Option A is correct because hiding the raw values can conceal important variation or separate groups. Option B is wrong because the topic is normally stated separately and is not hidden by averaging. Option C is wrong because the instrument's name is a method detail, not a pattern in the data. Option D is wrong because a signature has no role in interpreting numerical results. Exam cue: never treat an average as the whole distribution.

Related tags

AverageData DistributionHidden VariationNature And Meaning Of ScienceExploration: Entering The World Of Secondary ScienceExploration Entering The World Of Secondary ScienceScienceClass 9 Mcq

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