When doing any kind of research, it is important to decide whether you will use qualitative data, quantitative data or a mixed methods approach. A lot of research that is done in the medical field is quantitative.
The function of quantitative data is to use an accurate approach to collect and analyse any data that has been measured. It is generally precise and based upon numbers. One of the purposes of quantitative research is to be deductive, rather than inductive.
Quantitative research is numbers-based. This can make it very precise, which is important when you are doing research in the medical field. When used appropriately, the results of quantitative research can be generalised.
When you are doing quantitative research, you will need a hypothesis. You should select your approach to research based on what is suitable for your topic.