A study in which children are randomly assigned to receive either a newly formulated vaccine or the currently available vaccine, and are followed to monitor for side effects and effectiveness of each vaccine, is an example of which type of study?

Experimental

Explanation:

Experimental study: In research methods, an experimental study is described as a study in which the different conditions are considered to be under the direct influence or control of the researcher or the investigator. An experimental study is being employed or conducted in order to test the efficacy of a particular therapeutic or preventive measure. It can provide the investigator or the researcher with the 'strongest evidence' related to the occurrence of a "cause and effect relationship".

In the question above, the given statement signifies the experimental study.

Experimental

Explanation:

Subjects were children enrolled in a health maintenance organization. At 2 months, each child was randomly given one of two types of a new vaccine against rotavirus infection. Parents were called by a nurse two weeks later and asked whether the children had experienced any of a list of side-effects.

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