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A scientist 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 dependent variable in this experiment?

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She is experimenting with a placebo effect by giving one mouse the sugar.  The dependable variable would be the size of the tumor.  It depends on the effectiveness of Drug X and the amount given. 

Answer:

The correct answer is sugar and Drug X.

Explanation:

A variable whose influence or impact is examined on a dependent variable is known as an independent variable. In the given case, the concentration of drug X given to the mice varies just in order to understand the influence generated by the drug on mice. Similarly, one mouse is given sugar in place of Drug X in order to examine the influence of sugar on mice with cancer. Thus, in the given case, there are two independent variables used, that is, Drug X and sugar.

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