Podcast
Questions and Answers
What is a significant limitation of the one-group pretest-posttest design?
What is a significant limitation of the one-group pretest-posttest design?
In a nonequivalent control group design, which is a key concern?
In a nonequivalent control group design, which is a key concern?
What does a simple interrupted time series design involve?
What does a simple interrupted time series design involve?
What is a primary strength of the control group interrupted time series design?
What is a primary strength of the control group interrupted time series design?
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What is a major challenge associated with longitudinal designs in research?
What is a major challenge associated with longitudinal designs in research?
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Which aspect do cross-sequential cohort designs effectively address?
Which aspect do cross-sequential cohort designs effectively address?
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What is a common disadvantage of program evaluation methods?
What is a common disadvantage of program evaluation methods?
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What type of research design may be used to study age-related development?
What type of research design may be used to study age-related development?
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What distinguishes a comparative time series design from other designs?
What distinguishes a comparative time series design from other designs?
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What is an example of a limitation of time series designs?
What is an example of a limitation of time series designs?
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Study Notes
Pretest-Posttest Designs
- Alternatives to randomized controlled experiments are needed when participant assignment is impractical.
- One-group pretest-posttest design collects measures before and after an intervention but has significant weaknesses.
- This design does not effectively eliminate internal validity threats and may be affected by the regression to the mean.
Nonequivalent Control Group Design
- Involves groups that resemble the treatment group but have not received the intervention.
- Nonequivalent control group posttest-only design assesses groups after treatment is applied to one group, revealing potential pre-existing differences.
- Nonequivalent control group pretest and posttest design measures both groups before and after treatment but can still be vulnerable to internal validity threats.
- Ensuring similarity in groups involves finding closely matched control groups and gathering detailed participant information.
Time Series Designs
- Dependent variable measurements occur repeatedly before and after the quasi-independent variable implementation.
- Simple interrupted time series design captures multiple measurements before and after treatment.
- This design helps in observing if changes coincide with the treatment introduction.
- Variants include interrupted time series with reversals and multiple replications, showing variability over time.
- Limitations include challenges in manipulating the quasi-independent variable without permanent effects.
Control Group Interrupted Time Series Design
- Compares treated and non-treated groups in an interrupted time series format to mitigate historical effects.
- Enhances understanding of how the quasi-independent variable impacts both groups.
Comparative Time Series Design
- Examines correlations between changes in two or more variables over time.
Longitudinal Designs
- Treats time as the quasi-independent variable and is useful in developmental psychology for studying age-related changes.
- Presents barriers such as participant retention and funding, making long-duration studies challenging.
- Offers advantages over cross-sectional designs by focusing on age-related changes rather than generational effects.
Cross-Sequential Cohort Designs
- Involves tracking two or more cohorts across multiple times.
- This approach allows differentiation between age and cohort effects, enhancing data interpretation.
Program Evaluation
- Employs behavioral research methods to gauge the effectiveness of interventions aimed at behavior modification.
- Key purposes include assessing goal attainment, making decisions about program continuation, and identifying improvements for future programs.
Studying That Suits You
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Description
Explore the concepts of quasi-experimental designs in this quiz based on Chapter 13. Understand the intricacies of pretest-posttest designs, including their limitations and threats to internal validity. Learn why these alternative designs are necessary when random assignments are not feasible.
