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A student tests the effect of temperature on bacterial growth but allows different temperature groups to grow for different durations. What type of variable has incubation time become?

Answer and explanation

Correct answer: Confounding variable

The governing concept is control of variables. Temperature is intended to be the independent variable and bacterial growth is the dependent variable, but incubation time also influences growth. Because incubation duration changes between temperature groups, its effect becomes mixed with the temperature effect. It is therefore a confounding variable, making option B correct. It is not properly controlled, a unit, or a replicate of temperature.

Related tags

VariablesConfounding VariableBacterial GrowthExperimental ControlVariables In An ExperimentExploration: Entering The World Of Secondary ScienceExploration Entering The World Of Secondary ScienceScience

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