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.