In some research, the researchers are not able to use random assignment to divide participants among groups. instead, they compare preexisting groups, which results in a - design.

Quasi experimental design.

Explanation:

Quasi experimental design is the type of design used in researches by the researchers to divide the participants in some groups for the research purposes.

This type of design involves where groups are selected upon which the variable is tested. It does not involve any random pre selection processes for the division of the participants in the groups.

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