CEVAP:

In real-life problems, sometimes the researcher might suspect that there is a relationship between some variables. Is it possible to prove that if the value of the one variable changes then the value of another variable may also change? Take a baby as an example: normally as the baby gets older, his or her weight increases. But not all the babies weight increases as the same amount, from baby to baby the amount of change on the weight is different for each baby. It is very useful if we can measure whether there is a relationship between two variables and the size of the relationship. The method of finding the degree of relationship between the variables is called correlation analysis.