Data collected directly by researchers for the study they are currently undertaking
What is Secondary Data?
Data that's already available and that wasn't collected by the researcher for their current study.
What are the strengths and weaknesses of using secondary data?
S - less expensive and less time-consuming
W - It's not always in the most suitable format to test a hypothesis
What are the strengths and weaknesses of using Primary data?
S - the most suitable format to test a hypothesis
W - expensive and time-consuming to obtain
What is a Meta-analysis?
Combines results from multiple studies on the same topic to estimate the size of the effect of a treatment or intervention.
One strength of a Meta-analysis is that it usually has high validity but for Meta-analysis to have high validity, researchers must compare studies with the same research methods, that are valid and are well designed.
