Variables

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What is a variable in an experiment?

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A variable is any factor, trait, or condition that can exist in differing amounts or types. In experiments, variables are used to test hypotheses.

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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 a scientific experiment to test its effects on the dependent variable.

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What is a dependent variable?

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The dependent variable is the factor that is measured or observed in an experiment. It is affected by changes in the independent variable.

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What are controlled variables?

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Controlled variables are the factors that are kept constant throughout an experiment to ensure that the test results are valid.

Front

How many independent variables should be changed in an experiment?

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Only one independent variable should be changed at a time to ensure clear results.

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Why is it important to have controlled variables?

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Controlled variables are important because they help ensure that the results of an experiment are due to the independent variable and not other factors.

Front

Give an example of an independent variable in an experiment about plant growth.

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The type of liquid given to the plants (e.g., water, apple juice, milk) is an independent variable.

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What is the purpose of an experiment?

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The purpose of an experiment is to test a hypothesis by manipulating variables and observing the effects.

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What happens if you change more than one independent variable at a time?

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If more than one independent variable is changed, it becomes difficult to determine which variable caused the observed effects.

Front

What is a hypothesis?

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A hypothesis is a testable prediction about the relationship between two or more variables.