Answer: Observational
Explanation: Observational study involves careful and physical observation of events. In this kind of study, the independent variable is not under the control of the experimenter as opposed to experimental study.
In the scenario above, Observational study is used to draw inference from a sample to a population, by recording the number of physical or verbal attacks while the researcher observes. The researcher has no control over the independent variable as he only records what he observes.
Answer:
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The researchers were most concerned about External events.
<h3><u>Explanation: </u></h3>
Quasi-experimental designs are different from true experimental designs. They resemble the experimental research but it is not the real one. There are various types of quasi-experiment design, one of the important designs is the pretest and posttest design which is discussed in the above scenario.
The most likely reason for the experimental effect is based on selection bias. Self-fulfilling Prophecy & Instrument Decay might be the potential cause of the internal validity that is linked with the experiment done by the staff.
