Ascientist is testing the effectiveness of drug x on cancer. she gives a small amount of the drug to mice that have cancer. she gives each mouse a different amount from 1 to 10 grams, and then measures the size of the tumor in each mouse before the drugs and two weeks after the drugs. she gives one of the mice sugar instead of drug x. what is her independent variable in this experiment?

Drug X and Sugar

Explanation:

An independent variable is a variable whose impact or effect is studied on a dependent variable.

Here in this case the quantity of drug X given to mice (having cancer) is varied to understand the impact produced by this drug on mice.

Also, one mice is fed with sugar instead of Drug X to study the impact of sugar on mice affected with cancer.

hence, in this case their are two independent variable - Drug X and sugar.

while the mice are subject of the experiment on which the effect of test is to be determined.