6. How safe are anesthetics? (3.1, 3.6) The National Halothane Study was a major investigation of the safety of anesthetics. Performed in 34 major hospitals, the study showed the following death rates for four common anesthetics: Anesthetic Death rate A 1.7% B 1.7% C 3.4% D 1.9% There seems to be a clear association between the anesthetic used and the death rate of patients. Anesthetic C appears to be more dangerous.104 more A) Explain 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 related to a doctor's choice of anesthetic, it found that Anesthetic C was not causing extra deaths. Explain the concept of confounding in this context and identify a variable that might be confounded with the doctor's choice of anesthetic.

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6. How safe are anesthetics? (3.1, 3.6) The National Halothane Study was a major
investigation of the safety of anesthetics. Performed in 34 major hospitals, the study
showed the following death rates for four common anesthetics:
Anesthetic
Death rate
A
1.7%
B
1.7%
C
3.4%
D
1.9%
There seems to be a clear association between the anesthetic used and the death rate
of patients. Anesthetic C appears to be more dangerous.104
A) Explain 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 related to a doctor's choice
of anesthetic, it found that Anesthetic C was not causing extra deaths. Explain the
concept of confounding in this context and identify a variable that might be
confounded with the doctor's choice of anesthetic.
Transcribed Image Text:6. How safe are anesthetics? (3.1, 3.6) The National Halothane Study was a major investigation of the safety of anesthetics. Performed in 34 major hospitals, the study showed the following death rates for four common anesthetics: Anesthetic Death rate A 1.7% B 1.7% C 3.4% D 1.9% There seems to be a clear association between the anesthetic used and the death rate of patients. Anesthetic C appears to be more dangerous.104 A) Explain 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 related to a doctor's choice of anesthetic, it found that Anesthetic C was not causing extra deaths. Explain the concept of confounding in this context and identify a variable that might be confounded with the doctor's choice of anesthetic.
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