What is the purpose of the variable in an experiment?

Answer 1

Variables are properties or characteristics of some event,

object, or person that can take on different values or amounts.

When conducting research, experimenters often manipulate variables.

For example, an experimenter might compare the economies of three different countries:

Kenya-

Angola-

Tunisia-

in this case each country is a variable.

hence a variable serves to show variation i.e changes of a statistic or parameter.