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A student investigates whether music type affects reading speed. The sound intensity differs between music types. What should be done for a fair test?

Answer and explanation

Correct answer: Keep sound intensity the same for all music types

The governing principle of a fair test is changing only the intended independent variable. Here, music type is the independent variable and reading speed is the measured dependent variable. Sound intensity could also influence reading speed, so it must be kept the same for every music type. Thus, option A is correct. Keeping reading speed or music type constant would defeat the investigation, and different passages would introduce another confounding factor.

Related tags

VariablesFair TestControlled VariableMusic And ReadingVariables In An ExperimentExploration: Entering The World Of Secondary ScienceExploration Entering The World Of Secondary ScienceScience

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