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Pulse rate is measured after exercise in two groups. One group runs for five minutes and the other cycles for ten minutes. What is the biggest flaw in this design?

Answer and explanation

Correct answer: Both exercise type and duration are changing

Changing both exercise type and duration makes it unclear which factor changed pulse rate. Only one independent variable should be varied.

Related tags

VariablesExperimental DesignPulse RateConfoundingVariables In An ExperimentExploration: Entering The World Of Secondary ScienceExploration Entering The World Of Secondary ScienceScience

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