Section 1
Observational Studies
Book
Version 1
By Boundless
By Boundless
Boundless Statistics
Statistics
by Boundless
4 concepts
![Thumbnail](../../../../../../figures.boundless-cdn.com/17699/square/observation-and-study-hall.jpeg)
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.
![Thumbnail](../../../../../../figures.boundless-cdn.com/17928/raw/simpson-27s-paradox.jpg)
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.