Qualitative research is commonly used in the social sciences. Its aim is to gather in-depth understanding of the behaviors of human beings as well as the reasons that lead to such behaviors. On the other hand quantitative research is a systematic process of empirical investigation of phenomena and quantitative properties as well as their relationships.
Its aim is to employ as well as to develop theories, hypotheses and mathematical models related to certain phenomena. Measurements are very paramount to quantitative research processes. This is due to the fact that it provides a fundamental relation or connection between the mathematical expressions and the empirical observations.
Primary data is data that is collected for the first time. It has not been presented before and the researcher has to find it by him/her self. On the other hand secondary data is data that is used but not collected in its original format. It is collected from other sources like books, magazines, journals and news papers.