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A student investigates how fan speed affects cloth drying time. What happens if the amount of water in the cloth differs?

Answer and explanation

Correct answer: The amount of water will become an uncontrolled variable that affects the result

If the initial amount of water differs, the cloths may take different times to dry even at the same fan speed. Thus, water amount becomes an uncontrolled (confounding) variable and prevents a fair comparison of the effect of fan speed. Fan speed is the independent variable, while drying time is the dependent variable; the same amount of water should be used in each cloth. Exam tip: In a fair test, keep all factors other than the independent variable constant.

Related tags

Variables In ExperimentsControlled VariablesConfounding VariableFair TestDrying TimeFan SpeedVariables In An ExperimentExploration: Entering The World Of Secondary Science

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