Was this an experiment or an observational study?
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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Question
Men diagnosed with cancer were randomly assigned to either undergo surgery or not. Among the 338 men who had the surgery,15 eventually died of cancer, compared with 20 of the 335 men who did not have surgery.
a) Was this an experiment or an observational study?
Experiment because an observation was made about men diagnosed with cancer.
Experiment because men were randomly assigned to have surgery or not.
Observational study because an observation was made about men diagnosed with cancer.
Observational study because men were randomly assigned to have surgery or not.
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