It uses variables to represent a value that is not yet known.

The independent variables represent the domain of the observed values, such as for instance time and space.

The dependent variables represent the data being observed, for instance temperature, pressure or height.

Participants would be required to find natural numbers (from 1 to 9) that the variables could represent, as well as the solution.

The variable a represents the length of the petals of the rose.

A statistical endeavor, by contrast, uses a model that relates the game results to underlying variables representing the ability of each player.

Let and be the random variables representing the input and output of the channel, respectively.

Normality: For each group, each dependent variable must represent a normal distribution of scores.

The variables of the new problem represent each a set of variables of the original one.

In the above, the quantities ε are random variables representing errors in the relationship.