Describe quasi-experimental designs and true experiments. Which statement is correct?

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Multiple Choice

Describe quasi-experimental designs and true experiments. Which statement is correct?

The key idea is how internal validity and causal conclusions hinge on random assignment and control. Quasi-experimental designs involve manipulating the independent variable or taking advantage of a real-world intervention, but they do not use random assignment to groups and often lack full control over conditions. That lack of randomization means groups may differ in important ways other than the intervention, making causal conclusions less certain compared to true experiments. True experiments, on the other hand, include random assignment and tight control of extraneous variables, which helps ensure that observed effects are due to the manipulation of the independent variable rather than other factors. This is why true experiments are more capable of establishing causal inferences. So the statement that best captures the distinction is that quasi-experiments lack random assignment or full control of conditions. The other options misstate these features: true experiments do use randomization and control; they can support causal inferences; and quasi-experiments still involve some manipulation, just without the full safeguards of random assignment and control.

The key idea is how internal validity and causal conclusions hinge on random assignment and control. Quasi-experimental designs involve manipulating the independent variable or taking advantage of a real-world intervention, but they do not use random assignment to groups and often lack full control over conditions. That lack of randomization means groups may differ in important ways other than the intervention, making causal conclusions less certain compared to true experiments.

True experiments, on the other hand, include random assignment and tight control of extraneous variables, which helps ensure that observed effects are due to the manipulation of the independent variable rather than other factors. This is why true experiments are more capable of establishing causal inferences.

So the statement that best captures the distinction is that quasi-experiments lack random assignment or full control of conditions. The other options misstate these features: true experiments do use randomization and control; they can support causal inferences; and quasi-experiments still involve some manipulation, just without the full safeguards of random assignment and control.

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