Experimental and Non-experimental Hypothesis Testing Research :-
When the objective of a research is to test a research hypothesis, it is known as hypothesis-testing research.
Such research may be in the nature of experimental design or non-experimental design.
The research in which the independent variable is manipulated is known as ‘experimental hypothesis-testing research’
he research in which the independent variable is not manipulated is termed as ‘non-experimental hypothesis testing research’.
For example, assume that a researcher wants to examine whether family income influences the school attendance of a group of students, by calculating the coefficient of correlation between the two variables. Such an example is known as a non-experimental hypothesis testing research, because the independent variable - family income is not manipulated here.
Again assume that the researcher randomly selects 150 students from a group of students who pay their school fees regularly and then classifies them into two sub-groups by randomly including 75 in Group A, whose parents have regular earning, and 75 in Group B, whose parents do not have regular earning. Assume that at the end of the study, the researcher conducts a test on each group in order to examine the effects of regular earnings of the parents on the school attendance of the student. Such a study is an example of experimental hypothesis-testing research, because in this particular study the independent variable regular earnings of the parents have been manipulated.