Respuesta :
A prospective study that compares a group of smokers with a similar group of nonsmokers is not an experiment because it is a type of observational study.
The prospective study that compares groups of smokers and non-smokers is not a test due to the fact, that it is a sort of observational study, where the researcher only observes and collects data approximately what's happening. Whereas, an experimental examination consists of the institution in which the experimenter manipulates the variables or has manipulated over the variables.
A retrospective study takes a collection of humans – say a set with lung cancer – and appears again to peer what traits members of the institution have in common. With the lung cancer organization, smoking stood out. A potential study takes a collection of human beings – say a group that includes each smoker and nonsmokers but in any other case has many similar characteristics – and then follows the institution contributors over the years. For instance, years later the cancer rates in smoking and nonsmoking institution will be in comparison.
Learn more about the observational study here brainly.com/question/14393640
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