Independent or Dependent?

By Justin Fang


A variable is an object, event, idea, feeling, time period, or any other type of category you are trying to measure. There are two types of variables-independent and dependent.

Independent Variable

An independent variable is a variable that does not depend on another variable. Its exactly what it sounds like, a variable that stands alone and isn't changed by any variable that you're trying to measure.

Dependent Variable

A dependent variable is also what it sounds like. Depends, the variable depends on other factors.


1.If a scientist conducts an experiment to test the theory that a vitamin could extend a person’s life-expectancy, then:

The independent variable is the amount of vitamin that is given to the subjects within the experiment.

The dependent variable is life span.

2. John is saving money for a vacation to Canada. The more money he saves for the trip, the more days he will be able to stay in Thailand.

Independent the amount of money he saves

Dependent the amount of days she stays

3. John is making frosting for some cupcakes he baked earlier. The number of cupcakes he made dictates how much frosting is needed.

The independent variable is the number of cupcakes

The dependent is the frosting needed.