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In an investigation, sound intensity is changed and a person's reaction time is measured. Which is the dependent variable?

Answer and explanation

Correct answer: Reaction time

The direct answer is B: reaction time. The independent variable is what the experimenter changes, and the dependent variable is what is measured as the response. In this investigation, sound intensity is deliberately changed. The person's reaction time is then measured to see whether it changes, so reaction time depends on sound intensity. Option A, sound intensity, is the independent variable, not the dependent variable. Option B is correct because it is the measured outcome. Option C, source of sound, may be kept the same or controlled, but it is not the stated response. Option D, age, is a characteristic of the person and may be controlled or recorded; it is not the quantity measured as the effect here. Always separate the input from the result: changed input is independent, measured result is dependent.

Related tags

ScienceDependent-VariableReaction-TimeSoundVariables In An ExperimentExploration: Entering The World Of Secondary ScienceExploration Entering The World Of Secondary ScienceClass 9 Mcq

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