header bg

Question:

A tall man feeds his cows different amounts of food each day. He notices that the cows are happier on days when they receive the most food. In this situation, what is the independent variable?

A The amount of food
Explaination

An independent variable is something that is changed; something that causes an effect. In this case, the farmer was manipulating the amount of food the cows received (the independent variable) and measuring the happiness of the cows (the dependent variable).