What Is an Independent Variable

question 5

Multiple Choice

What is an independent variable?

• A) It is the measured variable that may change depending upon manipulation of an independent variable.
• B) It is any unmeasured variable that is uncontrolled within the context of the experiment.
• C) It is the variable that is intentionally manipulated by the researcher.
• D) It is an external variable that cannot be controlled by the researcher.

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Definitions:

Iritis

An inflammation of the iris, the colored part of the eye, which can cause pain, redness, and potentially, loss of vision if not treated.

Astigmatism

A condition in which the cornea has an abnormal shape, which causes blurred images during near or distant vision.

Strabismus

A condition that results in a lack of parallel visual axes of the eyes; commonly called crossed eyes.

Presbyopia

A condition associated with aging in which the eye exhibits a progressively diminished ability to focus on near objects.