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A student tests the cleaning ability of three soaps, but the initial stain size differs on each cloth. Which would be the fairest dependent variable?

Answer and explanation

Correct answer: दाग क्षेत्रफल में प्रतिशत कमी

When starting stain sizes are unequal, comparing only the final remaining area can be misleading: a larger starting stain may leave a larger area even after effective cleaning. Percentage decrease accounts for the starting value. It can be calculated as (initial area − final area) ÷ initial area × 100. Thus B gives a more comparable measure of cleaning performance; A alone does not fully correct the initial difference.

Related tags

Percentage DecreaseFair ComparisonDependent VariableCleaning ExperimentVariables In An ExperimentExploration: Entering The World Of Secondary ScienceExploration Entering The World Of Secondary ScienceScience

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