What are the dependent, independent & extraneous variables? Explain with suitable examples. Posted question is related with - Research Methodology

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When you are doing experiments in science, no matter what type, there are things that you manipulate, and results that occur as a result. The things you are in charge of are independent variables (IV). You may decide to test plant growth at different temperatures, or different carbon dioxide levels....

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When you are doing experiments in science, no matter what type, there are things that you manipulate, and results that occur as a result. The things you are in charge of are independent variables (IV). You may decide to test plant growth at different temperatures, or different carbon dioxide levels. The temp or CO2 level is your independent variable--you decide what level. The amount the plants grow is your dependent variable(DV)--the amount will be different, depending on your independent variable. When you graph your result, the IV goes on the X axis, the DV on the Y.

Extraneous variables are things that influence your results, and are a source of error. These are the things we attempt to control. For instance, if you are testing the influence of temp on plant growth, you want to make sure that soil type and amount of water given are constant; otherwise, they are extraneous variables.

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