What Makes for Good Variables?
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For Good Variables, You Should Answer "Yes" to Every Question
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Is the independent variable measurable?
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Yes / No
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Can you change the independent variable during the experiment?
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Yes / No
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Have you identified all relevant dependent variables, and are they all caused by and dependent on the independent variable?
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Yes / No
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Are all dependent variable(s) measurable?
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Yes / No
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Have you identified all relevant controlled variables?
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Yes / No
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Can all controlled variables be held at a steady value during the experiment?
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Yes / No
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