Experimental statistical studies, not observational studies, are those in which researchers have some influence over the variables of interest.
What is statistical studies?
The procedure of gathering, organizing, analyzing, interpreting, and presenting data in order to spot patterns and trends is referred to as "statistical studies".
A researcher cannot control the variables of interest in statistical studies in an observational study or other types of non-experimental research. Observational studies are based on information, conditions, and circumstances that are not relevant to statistical research.
As a result, observational studies is correct option.
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