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Section 1

Observational Studies

Book Version 1
By Boundless
Boundless Statistics
Statistics
by Boundless
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4 concepts
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What are Observational Studies?

An observational study is one in which no variables can be manipulated or controlled by the investigator.

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The Clofibrate Trial

The Clofibrate Trial was a placebo-controlled study to determine the safety and effectiveness of drugs treating coronary heart disease in men.

Confounding

A confounding variable is an extraneous variable in a statistical model that correlates with both the dependent variable and the independent variable.

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Sex Bias in Graduate Admissions

The Berkeley study is one of the best known real life examples of an experiment suffering from a confounding variable.

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