Quasi-Experimental Research
Quasi-experimental research is a methodological design that incorporates some, but not all, of the essential features of a true experiment. While researchers using this approach may introduce a treatment or comparison condition, they frequently fail to use random assignment to place participants into distinct groups or omit counterbalancing to control for potential order effects. Consequently, while it offers more control than purely correlational studies, quasi-experimental research generally possesses lower internal validity than true experimental research.
0
1
Tags
Ch.2 Psychological Research - Psychology @ OpenStax
Psychology @ OpenStax
OpenStax
OpenStax Psychology (2nd ed.) Textbook
Psychology
Social Science
Empirical Science
Science
KPU
Research Methods in Psychology - 4th American Edition @ KPU
Related
A researcher plans to investigate a cause-and-effect relationship by using a study design that requires them to create different groups by directly assigning participants to possess a certain characteristic or experience a specific condition. Which of the following research questions would be impossible to investigate using this specific type of design?
Quasi-Experimental Research
What is the primary reason a researcher might be forced to investigate a psychological relationship using nonexperimental approaches rather than a true experiment?
A researcher wants to study the long-term psychological effects of experiencing a natural disaster. Because the researcher cannot ethically or practically manipulate who experiences a natural disaster, they must use nonexperimental approaches to investigate this relationship.
In psychological research, certain factors prevent the use of studies where variables are directly changed. Match each term related to these limitations with its corresponding description.
A researcher wants to study if suffering from a significant early-childhood illness causes an increase in health anxiety during adulthood. Arrange the steps of the logical analysis the researcher must perform to conclude that a true experiment is not possible for this study.
A research team aims to study whether experiencing a catastrophic natural disaster during adolescence leads to a permanent increase in risk-avoidance behaviors in adulthood. Since they cannot ethically or practically manipulate which populations experience a disaster, they must synthesize a nonexperimental research plan. Which of the following proposals represents the most effective construction of a study to address this inability to manipulate the independent variable?
In psychological research, when active manipulation of an independent variable is not possible due to practical or ethical constraints, researchers must investigate the relationship using ________ approaches.
A researcher proposes studying the long-term effects of childhood malnutrition by assigning infants to a 'no-food' condition. An IRB reviewer correctly evaluates this design as impossible to implement because the researcher has a(n) _____ to manipulate the independent variable for ethical reasons, and must therefore rely on a nonexperimental approach instead.
A clinical psychologist wants to study the relationship between growing up with a chronically ill parent and the development of high health anxiety in adulthood. Because the researcher cannot ethically or practically manipulate whether a child's parent becomes chronically ill, they must investigate this relationship using a nonexperimental approach.
Analyze the scenarios and methodological constraints below. Match each research situation with the correct constraint or approach described in the context of variable manipulation.
Evaluate the methodological options for studying the relationship between early childhood illness experiences and adult hypochondriasis. Order the steps of the evaluation process a researcher must follow to determine and implement their research design.
According to the parent node, what are the two general reasons why a researcher might be unable to actively manipulate an independent variable, and what alternative research approach must be used in such situations?
Explain why Dr. Aris's experimental design is not possible. Describe the methodological change she must make to study this relationship, and identify what specific type of approach she must adopt.
Imagine a research team wanting to study the impact of childhood trauma (such as experiencing a natural disaster) on long-term anxiety levels in adulthood. Apply the concepts of variable manipulation to explain why they cannot conduct a true experiment, and specify the alternative method they should use.
According to research methods principles, what is the primary reason a true experiment might be impossible to conduct?
If a researcher wants to study the psychological effects of suffering a severe brain injury, they can design a true experiment by actively manipulating the independent variable.
Match each psychology study scenario with the primary constraint that prevents active manipulation of the independent variable, or select the option indicating that active manipulation is possible.
A researcher is designing a study on the long-term psychological effects of experiencing a severe natural disaster. Analyze the methodological workflow and arrange the following researcher decisions in the logical sequence that dictates the final study design.
When evaluating a proposed study intended to prove that experiencing a severe natural disaster causes long-term anxiety, a peer reviewer critiques the authors' claim of having designed a true experiment. The reviewer correctly concludes that the experimental design is fundamentally flawed because it is practically and ethically impossible to actively ____ the independent variable.
When a researcher cannot actively manipulate an independent variable for practical or ethical reasons, making a true experiment impossible, what general approach must they use to investigate the relationship?
Dr. Chen is studying the impact of parental incarceration on childhood development. Because she cannot ethically assign parents to be incarcerated, she studies children whose parents are already incarcerated and compares them to children whose parents are not. By forming these two comparison groups, Dr. Chen has successfully designed a true experiment.
Because intentionally causing a severe early illness in participants to study its psychological effects violates ethical standards, researchers are prevented from using a true experiment and must instead use ________ approaches to study the relationship.
Analyze the methodological constraints of the following proposed research questions. Which study fundamentally requires a nonexperimental approach because the independent variable cannot be actively manipulated for practical or ethical reasons?
As a peer reviewer, you must evaluate the methodological validity of studies claiming to use a true experimental design. Match each proposed experimental study to the most appropriate evaluative judgment regarding the active manipulation of its independent variable.
Types of Experimental Research
Basic Experimental Design Components
Interpreting Experimental Findings in Psychology
Reporting Research in Psychology
Weakness of Experimental Research: Artificial Settings
Ethical Constraints in Experimental Research
The Core Aim of Experimental Research
Primary Strength of Experimental Research: Establishing Causality
A researcher wants to test if a new note-taking strategy improves exam performance. They teach the new strategy to their morning class and the traditional strategy to their afternoon class. At the end of the unit, the morning class scores significantly higher on the exam. The researcher concludes that the new strategy causes better exam performance. Which of the following statements best analyzes the validity of this conclusion?
Falsifiability
Example of an Experiment: Lighting and Worker Productivity
Field Experiment
Inability to Manipulate Variables
Experimental Record Keeping
Non-Experimental Research
Quasi-Experimental Research
Comparison of Internal Validity Across Research Designs
Applications of Surveys
Laboratory Experiment
Single-Subject Research
Match each component of experimental research with its specific role or function in the study design.
A researcher wants to know whether a new memorization strategy causes higher quiz scores. She recruits 50 participants and allows each person to choose whether to use the new strategy or their usual approach. She then compares the average quiz scores of the two groups. This study qualifies as an experiment because it compares two groups on a measured outcome.
In experimental research, what is the primary objective of systematically manipulating an independent variable and randomly assigning participants to conditions?
Match each core component of experimental research with its specific role in the research process.
A researcher investigating the effect of exercise on mood assigns 50 participants to a high-intensity workout group and 50 participants to a stretching group by flipping a coin for each person. True or False: Because the researcher used randomized assignment and systematically manipulated the type of exercise, this study qualifies as experimental research.
Learn After
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.
Define quasi-experimental research and identify the specific methodological features of a true experiment that it frequently lacks, as well as its position relative to purely correlational and true experimental research regarding internal validity.
Based on the provided scenario, diagnose the type of research methodological design being used and justify why this design possesses lower internal validity compared to a true experiment.
A researcher conducts a study on memory where all participants complete the exact same sequence of tasks, introducing potential order effects. What specific methodological control should the researcher apply to this design to address these order effects and move it closer to a true experiment?
Which of the following best describes a key characteristic of quasi-experimental research?
A study that introduces a psychological treatment to one group and compares it to a control group, but fails to use random assignment, will generally achieve the same level of internal validity as a true experiment.
Dr. Aris evaluates a new behavioral intervention by implementing it in one elementary school while using a neighboring school as a control group. By utilizing intact, pre-existing schools, Dr. Aris introduces a treatment and comparison condition but omits random assignment for the students. Because it lacks this essential feature, this study is an example of ____ research.
A research team is analyzing the methodological components of quasi-experimental research. Match each aspect of study design to how it is specifically handled or described in a quasi-experiment.
A research committee is evaluating proposed study designs based on their ability to confidently support causal claims. Evaluate the structural control of the following methodological designs and arrange them in order from the lowest expected internal validity to the highest expected internal validity.
Quasi-experimental research offers more control than purely correlational studies, but it generally possesses lower ____ validity than true experimental research.
Why does quasi-experimental research generally possess lower internal validity compared to true experimental research?
A research methods instructor asks you to classify several study proposals. Match each hypothetical research scenario to the methodological design it best represents.
A psychologist tests the effectiveness of two different memory strategies by having all study participants first use Strategy A and then use Strategy B. Because the researcher actively manipulated the treatments, this design qualifies as a true experiment with high internal validity.
An educational psychologist is evaluating three proposed study designs to test whether a new computerized math tutoring program improves students' test scores. Evaluate the designs based on their susceptibility to selection threats and internal validity, and arrange them in order from the design with the lowest expected internal validity to the design with the highest expected internal validity.