Scientific Variables

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What is a dependent variable?

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The dependent variable is what the scientist is measuring in an experiment. It changes in response to the independent variable.

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What is an independent variable?

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The independent variable is the factor that is changed or controlled in an experiment to test its effects on the dependent variable.

Front

In an experiment, what does the term 'variable' refer to?

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A variable is any factor, trait, or condition that can exist in differing amounts or types.

Front

What is the purpose of a hypothesis in scientific investigation?

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A hypothesis is a testable prediction about the relationship between the independent and dependent variables.

Front

What is the relationship between independent and dependent variables?

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The independent variable is manipulated to observe its effect on the dependent variable.

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In the statement 'If I ride my bike to school instead of walking, then I will get to school faster', what is the dependent variable?

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The dependent variable is 'How fast you get to school'.

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In the question 'Does the type of gasoline put in a car affect how fast the car can drive?', what is the dependent variable?

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The dependent variable is 'how fast the car can drive'.

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What is an example of an independent variable in an experiment about driving skills?

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An example of an independent variable could be 'Age of student'.

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What is an example of a dependent variable in an experiment about phone service?

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An example of a dependent variable could be 'How good the service was'.

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Why is it important to control variables in an experiment?

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Controlling variables ensures that the results are due to the independent variable and not other factors.