Which of the following are quasi-experimental designs? (1) Interrupted Time-Series Designs (2) Non-equivalent Control Group Design (3) Time Series with Non-equivalent Control (4) Block randomization
(1), (2), and (3) only
Quasi-experimental designs, as classified by Campbell and Stanley and later Cook and Campbell, share the structure of true experiments but lack random assignment of participants to conditions.
Interrupted time-series designs, non-equivalent control group designs, and time series with a non-equivalent control group are all standard quasi-experimental designs used when randomisation is not feasible in field settings. Block randomization, on the other hand, is a technique of true experimental design in which participants are randomly assigned to treatments within homogeneous blocks, so it does not belong to the quasi-experimental family.
Hence, the quasi-experimental designs are (1), (2), and (3) only.
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