What is an observational study? What is a designed experiment? Which allows the researcher to cl

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What is an observational study? What is a designed...

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Key Concepts

Observational Study

An observational study is a type of research where the investigator simply observes and records data without manipulating the study environment. In these studies, data are collected as they naturally occur, which means that while relationships between variables can be identified, causal inferences are generally limited because external factors are not controlled.

Designed Experiment

A designed experiment is a research approach in which the investigator deliberately manipulates one or more explanatory variables and controls other conditions through random assignment and standardization. This controlled setting allows researchers to isolate the effects of the variable of interest and make stronger claims about cause-and-effect relationships.

Causation

Causation refers to the relationship between variables where a change in one variable directly induces a change in another. In the context of these study types, designed experiments are specifically structured to establish causation by controlling for confounding factors, whereas observational studies typically only reveal associations that may not reflect true causal connections.

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