Question

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.

Answer 1

In the absence of random assignment, researchers compare preexisting groups using a non-experimental or observational design, which can be subject to confounding variables.

Step-by-step explanation:

When researchers are unable to use random assignment to divide participants among groups, they compare preexisting groups, which results in a non-experimental or observational design.

Experimental design involves having a control group and an experimental group, with the only intended difference between them being the factor under investigation or manipulation.

However, certain circumstances, ethical concerns, or the nature of the research question may preclude the use of random assignment, leading to the use of naturally occurring groups.

These observational designs can still provide valuable insights, but they often come with increased risk of confounding variables, which can limit the ability to draw strong causal conclusions.

Answer 2

Answer: Quasi experimental design.

Step-by-step 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.