Experimental method: Experiments are designed to test hypothesis about cause and effect. Usually the relationship between two or more variables is observed by producing a change in one and observing its effect on the other. Apart from that, the direction and the degree of intensity of the change is established; that is, whether the effect is direct or inverse and how much change has taken place. The two variables whose relationship is observed are the independent variables. The independent variable is usually manipulate to observe what effect(s) it has on the other variable. The dependent variable is the observed; its from it, it is establish if the independent has produce a change and in what direction and the intensity of changes.
