What are variables? Discuss different types …

There are two types of variables in psychology: Independent- variable which the person manipulates Dependent- variable which is dependent on the independent variable. For example: study shows that listening to music helps improve sleep. In this example, the independent variable is listening to music and the dependent variable is improving sleep. Because the improvement of sleep is dependent on whether we listen to music(in this eg). Hope this helps

In Algebra, a variable is an alphabet which is used to represent the unknown number. It represents the value. A variable is a quantity that may be changed according to the mathematical problem. The generic letters which are used in many algebraic expressions and equations are x, y, z. In other words, a variable is a symbol for a number where the value is not known.

For example, x + 5 = 10

Here “x” is a variable.
 

Variables are broadly classified into two categories, namely:

Dependent Variable

The dependent variable is a variable that depends on the value of some other number or variable. In short, the dependent variable is the output of a function. The value of the dependent variable changes, if there is a change in the value of an independent variable. The variable is dependent because its value depends on what we put into the function.

Example: y = 4 + 2x

Here, y is called a dependent variable. The value of y completely depends on the function 4 + 2x

Independent Variable

The independent variable does not depend on any values. It is called the input of a function. The value of the independent variable is not affected by any values of a function.

Example: x = 2y + 3z

Here, x is called a dependent variable

y and z are the independent variables

Because the value of y and z are not affected by any other values.