Observational study vs Experiment
Observational study:
Looking at the data and form a hypothesis.
Example
Researcher collects data of heart patients administered with drug.
Creates hypothesis: Drug lowers the risk of heart attack.
Experiment:
Investigating the possibility of a causal connection.
Example Researcher collects a sample of the heart patients.
A Randomized experiment is an experiment when the sampling units are
randomly assigned to the groups.
#experiment #observation #observatory #randomizedexperiment