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Which of the following is true of an experiment but not of an observational study? [单选题 2分] A. A cause-and-effect relationship can be more easily inferred. B. The cost of conducting it is excessive. C. More advanced statistics are needed for analysis after the data are gathered. D. Possible confounding variables are more difficult to control.
理解问题Which of the following is true of an experiment but not of an observational study? [单选题 2分] A. A cause-and-effect relationship can be more easily inferred. B. The cost of conducting it is excessive. C. More advanced statistics are needed for analysis after the data are gathered. D. Possible confounding variables are more difficult to control.
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Which of the following is true of an experiment but not of an observational study?
[单选题 2分]
A.
A cause-and-effect relationship can be more easily inferred.
B.
The cost of conducting it is excessive.
C.
More advanced statistics are needed for analysis after the data are gathered.
D.
Possible confounding variables are more difficult to control.不在提醒