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What happens if controlled variables are not kept the same?

Answer and explanation

Correct answer: Correct interpretation of the result will be difficult

The direct answer is D: correct interpretation of the result will be difficult. In a fair experiment, only the independent variable should be changed; important other factors are controlled and kept the same. If a controlled variable changes too, it may also affect the outcome. Then we cannot tell whether the result was caused by the intended change or by the uncontrolled factor. A is wrong because an experiment will not always succeed. B is wrong because the independent variable does not disappear; the design simply becomes unreliable. C is wrong because measurements are still necessary. D correctly describes the loss of a fair comparison. Exam cue: two changing factors mean no clear cause.

Related tags

Uncontrolled-VariablesResult-InterpretationFair-TestVariables In An ExperimentExploration: Entering The World Of Secondary ScienceExploration Entering The World Of Secondary ScienceScienceClass 9 Mcq

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