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Example of a Quasi-Experimental Study: Anti-Bullying Program
An example of a quasi-experimental study lacking random assignment involves evaluating an anti-bullying program across two similar schools. A researcher implements the program in one school (the treatment group) and compares the bullying incidents to the other school (the control group). Although this design uses a comparison group, the inability to randomly assign individual students to the schools means there may be a selection effect; preexisting differences between the students in the two schools could alternatively explain any observed differences in bullying.
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Research Methods in Psychology - 4th American Edition @ KPU
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Example of a Quasi-Experimental Study: Sex and Spatial Memory
One-Group Posttest Only Design
One-Group Pretest-Posttest Design
Nonequivalent Groups Design
Example of a Quasi-Experimental Study: Anti-Bullying Program
Selection Effect
Comparison of Internal Validity Across Research Designs
Tuskegee Syphilis Study
Elimination of Directionality Problem in Quasi-Experiments
Applications of Quasi-Experimental Research
Causal Limitations of Quasi-Experimental Research
Which of the following is a key characteristic that distinguishes quasi-experimental research from a true experiment?
Match each feature of a quasi-experimental design with the specific role it plays or the consequence it has on the quality of a psychological research study.
A clinical psychologist evaluates the effectiveness of a new mindfulness-based therapy by providing the treatment to all patients at one clinic while patients at a neighboring clinic receive standard care. Because the researcher is manipulating the treatment but is using pre-existing groups rather than assigning individual patients to conditions by chance, this study is best categorized as a(n) _________ research design.
A psychologist is testing the impact of a new peer-mentoring program in a local high school. Arrange the logical sequence of steps the psychologist would take to conduct a study that follows a quasi-experimental design and evaluates the strength of its causal claims.
A researcher claims that their quasi-experimental study provides the same level of confidence in causal conclusions as a true experiment because both designs involve the manipulation of an independent variable. This evaluative claim is scientifically sound.
Although quasi-experimental research offers more control than purely correlational studies, it generally possesses lower internal validity than a true experiment because it lacks random assignment or counterbalancing.
A researcher evaluates a new educational software by implementing it in one classroom and comparing the results to another classroom that continues with the standard curriculum. Which statement best explains why this quasi-experimental design has lower internal validity than a true experiment, yet still provides more control than a purely correlational study?
A psychology instructor asks students to match scenarios with their corresponding design feature. Match each research description to the quasi-experimental design feature or consequence it applies.
An investigator is analyzing the methodological differences between two research proposals. Study A uses random assignment and counterbalancing, whereas Study B implements a comparison condition using pre-existing groups without random assignment. In analyzing their quality, the investigator concludes that Study B generally possesses lower _____ than Study A.
Evaluate the following research design scenarios based on the standard of internal validity and control established in methodology. Arrange them in order from the design that provides the HIGHEST level of internal validity to the design that provides the LOWEST level of internal validity.
Learn After
When a researcher evaluates an anti-bullying program by implementing it in one school and comparing the results to a second similar school, what major limitation makes this a quasi-experimental study?
Based on the example of the anti-bullying program study, match each component of the research design with its correct role or methodological concern.
A researcher implements an anti-bullying program in School A and uses School B (which did not receive the program) as a comparison. After one semester, bullying incidents in School A drop by 30% while School B shows no change. The researcher concludes: 'The anti-bullying program caused the reduction in bullying at School A.' Is this causal conclusion fully justified by the study design?
In the example of the anti-bullying program study, a researcher evaluates an intervention across two similar schools but lacks the ability to use random assignment. Arrange the following steps to demonstrate the logical sequence of how this specific design limitation creates a 'selection effect' that threatens internal validity.
A researcher finds that bullying decreased in a school that implemented a new program compared to a similar school that did not. To critically evaluate the claim that the program was responsible for this change, the researcher must account for a(n) ________ effect, which serves as a plausible alternative explanation for the findings because participants were not randomly assigned to the schools.
You are tasked with designing a modification to the anti-bullying study example to account for potential 'selection effects' (preexisting differences between schools). Arrange the following steps to construct a research protocol that establishes a baseline and evaluates the program's impact relative to that baseline.
In the quasi-experimental anti-bullying program study, students are randomly assigned to either the school that receives the program or the school that does not receive the program.
In the quasi-experimental study evaluating an anti-bullying program across two schools, how does a 'selection effect' function as an alternative explanation for the reduction in bullying at the treatment school?
In the quasi-experimental anti-bullying program study, match each design feature or observed outcome to its correct methodological function or implication.
A school board is reviewing the quasi-experimental anti-bullying study to decide whether district-wide adoption is warranted. A research-literate board member argues the evidence is insufficient, reasoning that the study cannot eliminate _____ as a rival explanation—the possibility that students in the two schools already differed in meaningful ways before the program was ever introduced.