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In an investigation salt concentration is the independent variable. Which option is the best set of its levels?

Answer and explanation

Correct answer: Zero percent, five percent, ten percent, fifteen percent

The governing concept is choosing clear levels of an independent variable. Salt concentration is quantitative, so its levels should be numerical, ordered, and expressed with a unit or percentage. Option A provides four directly comparable concentrations: 0%, 5%, 10%, and 15%. The other choices use temperature, unrelated descriptors, or subjective categories, so they do not represent salt-concentration levels and cannot support a clear comparison.

Related tags

VariablesIndependent VariableConcentrationQuantitative LevelsVariables In An ExperimentExploration: Entering The World Of Secondary ScienceExploration Entering The World Of Secondary ScienceScience

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