Variables in Experiments

What is an independent variable?

• A variable that is measured or observed in an experiment.

• A variable that is not relevant to the experiment.

• A variable that is determined by chance in an experiment.

• A variable that is manipulated or controlled by the researcher in an experiment.

What is a dependent variable?

• A dependent variable is the variable being measured or observed in an experiment or study.

• A dependent variable is the variable that is manipulated or changed in an experiment or study.

• A dependent variable is the variable that is not affected by the independent variable in an experiment or study.

• A dependent variable is the variable that is controlled by the researcher in an experiment or study.

In an experiment, the variable that is intentionally changed or manipulated by the researcher is called the ________ variable.

• independent

• extraneous

• controlled

• dependent

In an experiment, the variable that is measured or observed to determine the effect of the independent variable is called the ________ variable.

• extraneous

• independent

• dependent

• control

Which of the following is an example of an independent variable? a) Temperature b) Height c) Weight d) Age

• a) Temperature

• c) Weight

• b) Height

• d) Age.

Which of the following is an example of a dependent variable? a) Time b) Gender c) Color d) Distance

• c) Color

• b) Gender

• d) Distance

• a) Time

In a study investigating the effect of fertilizer on plant growth, what is the independent variable?

• water

• fertilizer

• sunlight

• soil type

In a study investigating the effect of sleep on memory, what is the dependent variable?

• memory

• independent variable

• sleep

• study participants

Why is it important to control variables in experiments?

• To make the experiment more complicated.

• To save time and resources.

• To confuse the participants.

• To ensure accurate and reliable results

Which of the following is NOT a way to control variables in an experiment? a) Random assignment b) Replication c) Manipulation d) Keeping all other variables constant

• b) Replication

• a) Random assignment

• d) Changing the dependent variable

• c) Manipulation