Interrupted Time-Series Design with Nonequivalent Groups
An interrupted time-series design with nonequivalent groups is a quasi-experimental approach that enhances the basic interrupted time-series design by incorporating a control group. This methodology involves taking multiple measurements of a dependent variable at regular intervals over an extended period both before and after an intervention is implemented across two or more groups that were not randomly assigned. By comparing the baseline and post-intervention trends of the treatment group to those of the nonequivalent control group, researchers can obtain stronger evidence regarding the effectiveness of the intervention.
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Research Methods in Psychology - 4th American Edition @ KPU
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Example of an Interrupted Time-Series Design: Factory Shift Reduction
Example of an Interrupted Time-Series Design: Student Absences
Interrupted Time-Series Design with Nonequivalent Groups
AB Design
Advantage of Interrupted Time-Series Over Pretest-Posttest Designs
Which of the following procedures is the defining characteristic of an interrupted time-series design?
In an interrupted time-series design, researchers rely on a single measurement before and a single measurement after a treatment to distinguish the actual effect of an intervention from normal variation.
A clinical psychologist wants to evaluate the impact of a new mindfulness-based stress reduction (MBSR) program on patients' anxiety levels using an interrupted time-series design. Arrange the following steps of the study in the correct chronological order.
Researchers using an interrupted time-series design must analyze data patterns to determine the internal validity of an intervention. Match each hypothetical data pattern with the analytical conclusion it most strongly supports.
You are designing a quasi-experimental study to determine if a new 'Mandatory Recess' policy (implemented on October 1st) improves elementary students' focus. To create an interrupted time-series design that distinguishes the policy's effect from the natural 'mid-semester slump' in student engagement, which of the following data collection schedules should you propose?
In an interrupted time-series design, measurements of a dependent variable are taken at regular intervals both before and after the treatment is introduced.
A researcher critiquing a study that relies on a single 'before-and-after' measurement argues that this method is insufficient to judge an intervention's success. To accurately evaluate whether an observed change reflects a genuine intervention effect rather than _____, the researcher recommends using an interrupted time-series design with multiple measurements before and after the treatment.
A team of psychologists wants to choose the correct methodology for different studies. Match each research scenario or description with the most appropriate design term based on the interrupted time-series methodology.
An investigator is analyzing the source of fluctuations in a study on workplace productivity. They note that a simple pretest-posttest design makes it difficult to separate treatment effects from normal variation. To better distinguish the actual effect of the intervention from normal variation, the researcher should use an interrupted time-series design to incorporate _____ measurements of the dependent variable before and after the treatment.
A research methods class is evaluating the validity of a proposed study on student absences. Arrange the steps below in the correct chronological order to properly execute an interrupted time-series design.
Posttest Only Nonequivalent Groups Design
Pretest-Posttest Nonequivalent Groups Design
Interrupted Time-Series Design with Nonequivalent Groups
What is the defining characteristic of a nonequivalent groups design?
Because a nonequivalent groups design does not use random assignment, researchers must expect that their comparison groups will likely have pre-existing differences that could threaten the internal validity of their research.
A psychology researcher is investigating the effectiveness of a new 'Study Skills' seminar. Match each research scenario with the specific reason it constitutes a nonequivalent groups design.
Analyze the logical progression of how a nonequivalent groups design introduces threats to internal validity. Arrange the following steps in the correct order to show the relationship between the design choice and the resulting experimental confounding.
As a school psychologist, you are tasked with designing a study to evaluate whether a new 'Peer Mediation' program reduces playground conflict. If you are required to use a nonequivalent groups design, which of the following research plans should you develop?
A nonequivalent groups design is a type of between-subjects design where researchers do not use _____ assignment to allocate participants to conditions.
When evaluating whether a researcher can justify causal conclusions in a nonequivalent groups design, a critic would point out that the lack of random assignment fails to control for _____ variables, which serve as alternative explanations for the results.
A researcher compares a school that voluntarily implements a new mindfulness program with another school that does not. At the end of the year, students at the mindfulness school score significantly higher on a test of emotional regulation. True or False: Because this is a nonequivalent groups design, the researcher can confidently conclude that the mindfulness program caused the improvement in emotional regulation.
A researcher investigates a new teaching method by comparing two existing classrooms. Match each component of this nonequivalent groups design study with its corresponding analytical description.
Arrange the steps in the correct logical order to evaluate the validity of a researcher's causal claim in a study using a nonequivalent groups design.
Learn After
Example of an Interrupted Time-Series Design with Nonequivalent Groups: Factory Shift Reduction
Example of an Interrupted Time-Series Design with Nonequivalent Groups: Student Absences
What is the defining feature that an interrupted time-series design with nonequivalent groups adds to a basic interrupted time-series design?
A researcher is evaluating a new mindfulness program in a psychiatric clinic using an interrupted time-series design with nonequivalent groups. Arrange the steps of this study in the correct methodological order.
A researcher investigates the effectiveness of a new 'Stress-Reduction Workshop' at Hospital A by measuring staff burnout levels every month for one year before and one year after the workshop is introduced. To strengthen the evidence, they also track monthly burnout levels at Hospital B, a similar facility where no workshop is offered. Match each element of this study to its appropriate methodological role.
In an interrupted time-series design with nonequivalent groups, if both the treatment group and the nonequivalent control group show an identical, sudden shift in the dependent variable at the point in time the intervention was introduced to the treatment group, the researcher can still safely conclude that the intervention was the primary cause of the change in the treatment group.
Which of the following best describes how groups are formed in an interrupted time-series design with nonequivalent groups?
Which of the following best explains how a researcher uses a nonequivalent control group to strengthen the conclusions of an interrupted time-series design?
When evaluating the internal validity of a quasi-experimental study, the interrupted time-series design with nonequivalent groups is judged as superior to a single-group design because the control group provides a necessary _____ for determining whether the treatment group's change is truly due to the intervention rather than a coincidental historical event.
A school psychologist measures the monthly disciplinary incidents at two different middle schools (School A and School B) for six months before and six months after School A implements a new restorative justice program. Because students were not randomly assigned to the schools, this scenario represents an application of an interrupted time-series design with nonequivalent groups.
Match each methodological component of an interrupted time-series design with nonequivalent groups with the analytical purpose it serves in evaluating an intervention.
To evaluate whether a quasi-experimental study's results are due to the intervention itself rather than external historical factors, a researcher should compare the baseline and post-intervention trends of the treatment group to those of a nonequivalent _____.