Independent, Dependent and Controlled Variables

In this scenario, the scientist is investigating the effect of vitamins on squid lifespan.  What is the independent variable?

• lifespan of the squid

• vitamins

• Amount of vitamins

• Color of Squid

• Mass of Squid

The independent variable depends on other variables in the experiment.

• True

• False

The dependent variable is 

• amount of vitamins

• squid lifespan

• squid size

• vitamin color

What is a controlled variable?

• A factor, trait or conditions which is not changed.

• The factor, trait or condition that is changed by the experimenter.

• The factor, trait or condition that changes because of the the independent variable.

If you do not have controlled variables 

• Your results are meaningless.

• Your results are amazing.

How many independent variables are there?

• 1

• 2

• none

How many constants are there?

• none

• As many as you can.

• 1

• 2