Dependent and Independent Variables
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What is an INDEPENDENT variable?
The INDEPENDENT variable is the thing you CHANGE.
What is a DEPENDENT variable?
The DEPENDENT variable is the thing you OBSERVE.
What is a CONTROL?
The CONTROL variable is the NORMAL OR STANDARD state of the observed situation.
An entomologist (bug scientist) wants to determine if temperature changes how many times a cricket chirps. What is the DEPENDENT variable?
The amount of times a cricket chirps.
Harvester ants often strip a bush of all of its leaves. Some people believe this helps the plant grow thicker, healthier stems. In an experiment, a student stripped off all the leaves from a set of plants. In a second set of identical plants, the student allowed ants to strip off the plants’ leaves. In order to improve this experimental design, it is most important to add a set of plants-
that still have their leaves (aka a control)
A florist wants to see if Product X will extend the life of cut flowers so that they last longer. What is the DEPENDENT variable?
The life of cut flowers.
You want to test a new drug that supposedly prevents sneezing in people allergic to grass. What is the INDEPENDENT variable?
The new drug