what is a dependant variable

A dependent variable is a variable that changes as a result of the independent variable manipulation in experiments. It is the outcome that researchers are interested in measuring, and it "depends" on the independent variable. Dependent variables are studied under the supposition or demand that they depend, by some law or rule, on the values of other variables. In other words, dependent variables are variables that are affected by other variables in the experiment. Some common dependent variables include human population size, test scores, and incidence of asthma. In contrast, independent variables are variables that are not seen as depending on any other variable in the scope of the experiment in question. They are variables that researchers manipulate or vary in an experimental study to explore their effects. Some common independent variables include time, space, density, mass, and fluid flow rate.