The cost of textbooks for a school increases with the average class size. Identify the independent and dependent quantity in the situation.

A/number of classes; average class size

B/cost; number of classes

C/average class size; cost

D/cost; average class size

C/average class size; cost

A variable is an object which is to be measured in a study either manipulated or the outcome of the study.

Independent variable is the variable which can be manipulated or controlled.

Dependent variable is the variable-outcome which is yielded after the independent variable or aimed variable.