Experimental research and quasi-experimental research can be distinguished on the basis of

Correct option is B

The correct answer is random assignment of subjects to experimental condition.
● 1. In experimental research, participants are randomly assigned to different groups (e.g., experimental and control groups).
● 2. Quasi-experimental research does not use random assignment. Instead, participants are grouped based on pre-existing characteristics or self-selection.
● 3. Random assignment helps control for confounding variables, ensuring that the differences in outcomes are due to the manipulation of the independent variable.

Information Booster
● 1. Random Assignment: This process is essential for ensuring internal validity in experimental research, as it reduces the risk of bias or pre-existing differences between groups.
● 2. Quasi-experimental Research: This type of research is often used when random assignment is not feasible or ethical, such as in natural settings or when studying specific populations.
● 3. Manipulation of Independent Variables: Both experimental and quasi-experimental research manipulate independent variables, but it is the use of random assignment that distinguishes them.
● 4. Causal Relationships: Experimental research is typically designed to determine causal relationships, while quasi-experimental designs can suggest associations but are less definitive in establishing causality.
● 5. Validity: Random assignment increases internal validity and helps in isolating the effect of the independent variable on the dependent variable.
● 6. In quasi-experimental research, the lack of random assignment often leads to lower internal validity due to potential confounding factors.