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Mathematics, 19.01.2021 19:40 PlzHelpMeOutKam3919

Are anesthetics safe? The National Halothane Study was a major investigation of the safety of anesthetics used in surgery. Records of over 850,000 operations performed in 34 major hospitals showed the following death rates for four common anesthetics: Anesthetic A B C D
Death 1.7% 1.7% 3.4% 1.9%
There seems to be a dear association between the anesthetic used and the death rate of patients. Anesthetic C appears to be dangerous.
A) Select the best explanation for why we call the National Halothane Study an observational study rather than an experiment, even though it compared the results of using different anesthetics in actual surgery.
B) When the study looked at other variables that are confounded with a doctor's choice of anesthetic, it found that Anesthetic C was not causing extra deaths. Suggest several variables that are mixed up with what anesthetic a patient receives.

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