Which of the following is the typical research design used for evaluation in a community/public health agency?

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Time series design is very useful because it allows pretest and posttest results to be compared in order to demonstrate that change did (or did not)occur.Later evaluations indicate whether the change was lasting.Because nurses cannot manipulate variables or use control groups,only quasi-experimental methods,not random clinical trials,can be used.

Which of the Following Is the Typical Research Design Used