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because eating raises the metabolic ratę, and no record was kept of what the subjects ate after exercising. Was this study an experiment? Why or why not? What are the explanatory and response variables?
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:6
|
Anesthetic |
A |
B |
C |
D |
|
Death ratę |
1.19/& |
1.7% |
3.4% |
1.9% |
There is a elear association between the anesthetic used and the death ratę of patients. Anesthetic C appears dangerous.
(a) Explain why we cali 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 causir extra deaths. Suggest several variables that are mixed up with what anesthetic a patient receives.
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