In an experiment to see the effects of alcoholic beverages on behavior, a placeb
ID: 3200209 • Letter: I
Question
In an experiment to see the effects of alcoholic beverages on behavior, a placebo is: the place where the subjects go when they have to sleep off the effects of alcohol. non-alcoholic beer that looks and tastes just like regular beer but contains no alcohol. a procedure for deciding who gets regular beer. the sampling method. the randomization procedure. The main advantage of experiments over observational studies is that: an experiment can compare two or more groups. we can include more than one explanatory variable in the study. a well-designed experiment can give good evidence that the treatment actually causes the response, an experiment is always shorter, an experiment is always cheaper.Explanation / Answer
The correct option is,
Non-alcoholic beer that looks and tastes just like regular beer but contains no alcohol.
Question 4 of 7
The correct option is,
A well-designed experiment can give good evidence that the treatment actually causes the response.
Because,
In an experiment, the person conducting the study controls all (or almost all) of the factors. In the end, he can be sure that whatever effect being observed is attributed to the identified factor, as all other factors are controlled. This is good for cause-and-effect study.
With observational studies, none of the factors are controlled. In the end, the person conducting the study is never sure whether the effect can be attributed to the suspected causal factor alone, or whether there are other factors in the system. Thus, it is not very good if you are trying to determine the cause of the effect.
That is the main advantage of performing experiments over observations.
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