What does correlation analysis tell the researcher about two variables?

Answer) For statistical evaluation of two variables, researchers perform correlation as it tells researcher the strength of relationship between two variables. This is a useful analysis for researcher when he or she wants to establish the possible connections among two variables. Correlation analysis tells the researcher either there is correlation among two variables or not. If correlation is found then this analysis further tells researcher that change in one variable will cause the change in other variable and this change can be positive or negative. Positive change means increase in one variable will cause the increase in other variable and vice versa.