As it is with true experimental designs, in quasi-experimental studies sometimes it may be necessary to:

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In quasi-experimental studies, researchers do not have full control over the independent variable and may not be able to randomly assign participants to conditions. Therefore, it is possible that the intervention did not have a significant effect on the outcome variable. In this case, it is appropriate to conclude that the intervention did not have any effect, rather than continuing to collect data or introducing additional variables.

As It Is with True Experimental Designs, in Quasi-Experimental Studies