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Situations Requiring a Between-Subjects Design
A between-subjects design becomes strictly necessary when a within-subjects approach is difficult or impossible to carry out. This typically occurs in two main scenarios: first, when severe time constraints make it unfeasible to test each individual in all conditions; and second, when an experiment involves a treatment meant to produce long-term behavioral changes. In the latter case, a successful initial treatment permanently alters the participants, making them unsuitable for subsequent testing in a control condition.
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Research Methods in Psychology - 4th American Edition @ KPU
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Situations Requiring a Between-Subjects Design
According to the general rule of thumb for experimental design choice, under which specific conditions should a researcher prioritize a within-subjects approach?
According to the general rule of thumb for choosing an experimental design, arrange the following decision-making steps in the correct order of logical priority, starting with the default preference.
A cognitive psychologist wants to compare how two different 20-minute exercise routines affect concentration. Each participant is available for only a single 30-minute session. According to the rule of thumb for experimental design choice, the psychologist should implement a within-subjects design.
Analyze the constraints and research goals in each scenario and match them to the most appropriate experimental design and rationale based on the general rule of thumb for design choice.
According to the general rule of thumb for experimental design choice, what should a researcher do if there is insufficient time to test every participant in all experimental conditions?
The general rule of thumb for experimental design choice indicates that a researcher should prioritize a within-subjects design as long as there is enough time for testing and carryover effects are not a serious concern.
A researcher is evaluating a study proposal where participants are available for 90 minutes to test two different 15-minute cognitive tasks. The proposal suggests a between-subjects design. According to the standard rule of thumb for experimental design choice, the researcher should critique this proposal and suggest prioritizing a(n) _____ design instead, given the ample time and lack of serious carryover concerns.
Based on the general rule of thumb for experimental design choice, match each researcher's scenario to the correct design decision.
A cognitive psychologist analyzes their experimental constraints and discovers that exposure to the first condition causes a permanent learning effect. Because this creates a confounding carryover effect that cannot be controlled, the rule of thumb indicates the researcher should consider a _____ design instead.
Arrange the steps a researcher must take to evaluate and finalize their experimental design choice based on the standard rule of thumb, starting with the default preference.
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Example of Time Constraints in Between-Subjects Designs
Example of Long-Term Change in Between-Subjects Designs
Under which of the following conditions does a between-subjects design become strictly necessary?
When an experimental treatment is intended to produce a permanent behavioral change, researchers must use a between-subjects design rather than a within-subjects design.
Match each research scenario below with the primary reason why a between-subjects design is strictly required rather than a within-subjects design.
A researcher is testing a specialized training program that permanently enhances a person's ability to recognize micro-expressions. Arrange the following steps to logically demonstrate why a between-subjects design is required for this experiment.
A researcher is designing a proposal for a study to test a new therapy that permanently reduces social anxiety. Given a $1,500 budget for a single -hour laboratory rental to test participants, which of the following research plans correctly constructs a valid design that integrates both the nature of the therapy and the logistical constraints?
A between-subjects design becomes strictly necessary when severe _____ constraints make it unfeasible to test each individual in all experimental conditions.
A researcher evaluates a claim that a within-subjects design is suitable for testing a clinical treatment meant to produce long-term behavioral changes. They reject this claim, noting that the design is invalid because the intervention's _____ makes it impossible for participants to return to their baseline state for subsequent testing in a control condition.
A researcher is studying shoppers waiting in a fast-moving checkout line where each individual is only available for 2 minutes. The study compares two cognitive tasks, each requiring 1.5 minutes to explain and complete. To test the effects of both tasks under these conditions, the researcher must apply a between-subjects design rather than a within-subjects design.
Analyze the following research scenarios and match each with the correct methodological limitation or feasibility status that determines whether a between-subjects design is strictly necessary.
A researcher is deciding between a within-subjects and a between-subjects design. Order the steps they should take to evaluate the feasibility of a within-subjects design and determine if a between-subjects design is strictly necessary.