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Which option classifies the variable correctly?

Answer and explanation

Correct answer: Changed fertiliser amount as independent variable

The governing concept is the distinction among independent, dependent and controlled variables. The independent variable is deliberately changed by the investigator; the dependent variable is measured as the response; controlled variables are kept constant. In option B, the amount of fertiliser is intentionally changed between plant groups, so it is the independent variable. Measured time or height would generally be outcomes and therefore dependent variables, not independent or controlled ones. Same soil could be a controlled condition if kept constant, but it is not a dependent variable. Thus B is the only correctly classified statement.

Related tags

Variable-ClassificationIndependent-VariableFertiliserControlled-VariableVariables In An ExperimentExploration: Entering The World Of Secondary ScienceExploration Entering The World Of Secondary ScienceScience

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