Variables Practice

What is an independent variable in an experiment?

• The variable that is measured

• The variable that is kept constant

• The variable that is changed by the experimenter

• The variable that is affected by the changes in the experiment

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DOK Level 1: Recall

Which of the following is a dependent variable?

• The variable that is manipulated by the researcher

• The variable that remains unchanged throughout the experiment

• The variable that is measured in the experiment

• The variable that is used as a control

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DOK Level 1: Recall

In an experiment to test the effect of light on plant growth, what would be a controlled variable?

• The amount of water given to the plants

• The height of the plants

• The type of light used

• The growth rate of the plants

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DOK Level 1: Recall

If you are testing the effect of different fertilizers on plant growth, what is the independent variable?

• The type of fertilizer used

• The amount of sunlight the plants receive

• The growth rate of the plants

• The amount of water given to the plants

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DOK Level 2: Skill/Concept

In a study measuring the impact of study time on test scores, what is the dependent variable?

• The number of hours spent studying

• The test scores

• The difficulty of the test

• The time of day the test is taken

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DOK Level 2: Skill/Concept

It is important to control variables in an experiment to ensure that the results are due to the (a)   only.

• independent variable
• make the experiment more complicate
• increase the number of variables be
• ensure that the dependent variable

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DOK Level 2: Skill/Concept

Match each variable with its correct role in the experiment studying the effect of temperature on the time it takes salt to dissolve.

• Controlled variable

• The starting amount of salt

• Independent variable

• The time it takes to dissolve

• Dependent variable

• The temperature

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DOK Level 2: Skill/Concept

Match each variable description with its correct type in the context of an experiment studying the effect of temperature on the time it takes salt to dissolve.

• Dependent variable in the experiment

• The time it takes to dissolve

• Controlled variable in the experiment

• The temperature

• Independent variable in the experiment

• The starting amount of salt

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DOK Level 2: Skill/Concept

A researcher wants to study the effect of different temperatures on the time it takes salt to dissolve. What is the independent variable in this experiment?

• The temperature

• The time it takes to dissolve

• The starting amount of salt

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DOK Level 2: Skill/Concept

A scientist is testing the effect of different amounts of a medication on blood pressure. What is the independent variable?

• The blood pressure of the subjects

• The amount of the medication given

• The age of the subjects

• The diet of the subjects

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DOK Level 2: Skill/Concept