Which of the following is NOT an experimental design type?

The choice that identifies a design not typically classified as an experimental design type is indeed Single variable. Experimental designs generally involve systematic manipulation of variables to determine cause-and-effect relationships.

AB, Reversal, and Multiple baseline designs are indeed recognized experimental frameworks used in research, particularly in behavioral analysis.

• An AB design consists of two components: a baseline phase (A) and an intervention phase (B), allowing researchers to assess changes in behavior due to the intervention.

• Reversal design entails implementing an intervention and then withdrawing it during the course of the study, providing insight into the effects of the intervention on behavior by comparing phases.

• Multiple baseline designs involve implementing interventions at staggered times across different subjects, settings, or behaviors, allowing researchers to evaluate the effectiveness of interventions while controlling for extraneous variables.

In contrast, a Single variable design does not provide a systematic method to manipulate and observe the effects of that single variable in an experimental context. It lacks the necessary framework to reflect the rigor and control characteristic of experimental studies.