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Why will the conclusion be weak if the cloth in sunlight is large and the cloth in shade is small?

Answer and explanation

Correct answer: Cloth size may also affect drying time

To compare the effect of sunlight and shade fairly, the cloths should be of the same size. A larger cloth may hold more water and have a different surface area, so it may take a different time to dry than a smaller cloth. Therefore, any difference in drying time cannot be attributed only to the light condition. Option A is incorrect because drying time is the dependent variable, while light condition is the independent variable. Exam tip: In a fair test, control all factors except the independent variable.

Related tags

Variables In ExperimentFair TestControlled VariablesConfounding VariableDrying ExperimentScience Grade 9Variables In An ExperimentExploration: Entering The World Of Secondary Science

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