1.1 Three types of study designs
From the RQ, we know what data must be collected from the individuals in the study (the response and explanatory variables)... but how do we obtain this data? After all, data are important: they are the means by which the RQ is answered.
Three broad methods for obtaining data are to use:
- Descriptive studies (Sect. 1.2), for answering Descriptive RQs;
- Observational studies (Sect. 1.3), for answering Relational RQs; or
- Experimental studies (Sect. 1.4), for answering Interventional RQs.
The type of study depends on the type of RQ.