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In comparing the cleaning ability of three soaps a different type of stain was placed on each cloth. Why would the result be unreliable?

Answer and explanation

Correct answer: Type of stain was not controlled

The stain type can change cleaning difficulty so the comparison is not fair. Use the same stain on all samples.

Related tags

Controlled VariableSoap ExperimentReliabilityVariables In An ExperimentExploration: Entering The World Of Secondary ScienceExploration Entering The World Of Secondary ScienceScienceClass 9 Mcq

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