Answer:
Pre-experimental research design.
Explanation:
Because Pre-experiments are the simplest form of research design. In a pre-experiment, either a single group or multiple groups are observed subsequent to some agent or treatment presumed to cause change.
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If you need some of the advantages and disadvantages of Pre-experimental research design.
Advantages
As exploratory approaches, pre-experiments can be a cost-effective way to discern whether a potential explanation is worthy of further investigation.
Disadvantages
Pre-experiments offer few advantages since it is often difficult or impossible to rule out alternative explanations. The nearly insurmountable threats to their validity are clearly the most important disadvantage of pre-experimental research designs.
