Introduction to Earth Science — Unit test

Question 14 • WCA 4130 Earth and Space Science 1st Quarter 26-27

Which statement best describes the variables in a controlled experiment?

Answer

The independent variable is changed to see its effect on the dependent variable while all other conditions are unchanged.

The dependent variable is changed to see its effect on the independent variable while all other conditions are unchanged.

The independent variable is allowed to change, and the dependent variable is held constant to see what other conditions show a relationship.

The dependent variable is allowed to change, and the independent variable is held constant to see what other conditions show a relationship.

Explanation

In a controlled experiment, the researcher changes the independent variable and measures how it affects the dependent variable. Other conditions are kept the same so they do not influence the result. Choice A correctly describes this setup; choices B, C, and D mix up which variable is changed or measured.

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