An independent variable is a factor or condition that is manipulated or changed in an experiment to observe its effect on the dependent variable. It is the variable that is under the control of the experimenter.
Two examples of independent variables:
1. Amount of fertilizer applied: In a study investigating the effect of different amounts of fertilizer on plant growth, the independent variable would be the various levels of fertilizer applied to different groups of plants.
2. Temperature: In a research project exploring how temperature affects the speed of chemical reactions, the independent variable would be the different temperatures at which the reactions are conducted, such as 25°C, 35°C, and 45°C.
What is an independent variable? Provide at least two examples.
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