Examlex
Using two or three sentences, answer the following questions as concisely as possible.
-Explain what controls the activity of the heart muscle.
Sampling
The process of selecting a subset of individuals, objects, or observations from a larger population to make inferences about the whole.
Observational Studies
Research methods in which subjects are observed in their natural environment without any intervention by the researcher.
Reactivity
The tendency of a person to alter their behavior or response due to the awareness of being observed or measured.
Directionality Problem
An issue that arises when it is unclear whether one variable causes changes in another or vice versa, complicating the interpretation of study results.
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