Learn Before
Teaching Fractions Example of a Pretest-Posttest Nonequivalent Groups Design
To improve upon a posttest only approach when evaluating a new fraction teaching method, researchers can utilize a pretest-posttest nonequivalent groups design. In this setup, third graders in a treatment classroom take a baseline fraction test, receive the new instruction, and then take a final test. Concurrently, a control classroom takes the same tests but continues with traditional teaching. By comparing the pretest-to-posttest score changes across the two classrooms, researchers can better assess the intervention's impact. Nevertheless, preexisting differences such as varying teaching styles or distinct classroom environments remain potential confounding variables that could independently influence student motivation and math achievement.
0
1
Tags
KPU
Research Methods in Psychology - 4th American Edition @ KPU
Related
Teaching Fractions Example of a Pretest-Posttest Nonequivalent Groups Design
Random Assignment in Pretest-Posttest Designs
Anti-Drug Program Example of a Pretest-Posttest Nonequivalent Groups Design
Differential History
Pretest-Posttest Design with Switching Replication
In a pretest-posttest nonequivalent groups design, how are the groups structured and assessed to evaluate the effect of an intervention?
A researcher is evaluating a new mindfulness program in two different schools using a pretest-posttest nonequivalent groups design. Match each component of the study with the logical function it serves in this design.
A researcher evaluates a new study-skills workshop by measuring the GPA of two existing student clubs in September and again in December. Only one club attends the workshop. If both clubs show a GPA increase, but the workshop club's increase is significantly greater, the researcher can use the non-workshop club's data to argue that the improvement was not caused simply by students becoming more acclimated to the semester over time.
Arrange the research steps of a pretest-posttest nonequivalent groups design in the correct order required to logically isolate a treatment effect from natural maturation.
In a pretest-posttest nonequivalent groups design, both the treatment group and the nonequivalent control group complete an initial baseline measurement before the intervention occurs.
In a study using a pretest-posttest nonequivalent groups design, why is it specifically useful to compare the pretest-to-posttest change in the treatment group against the pretest-to-posttest change in the control group?
A researcher using a pretest-posttest nonequivalent groups design finds that both the treatment group and the control group improved their scores by exactly 15 points. In evaluating these results, the researcher should _____ the conclusion that the treatment was uniquely responsible for the observed improvement.
Imagine you are a school psychologist tasked with evaluating a new reading intervention program across two different elementary schools. You cannot randomly assign students to the program. Describe how you would set up a pretest-posttest nonequivalent groups design to evaluate this intervention, specifying your groups, measurements, and why this design improves upon a posttest-only approach.
Based on the case context, analyze how Dr. Rivera should interpret the results of her pretest-posttest nonequivalent groups design to determine if the wellness program was effective. What specific comparison must she make, and why does the decrease in both groups not necessarily invalidate the program's effectiveness?
A researcher argues that randomly assigning participants is the only valid way to evaluate an intervention. Using the principles of a pretest-posttest nonequivalent groups design, evaluate this claim. In one to three sentences, explain how this quasi-experimental design provides a strong alternative when random assignment is not possible.
A clinical psychologist wants to test the effectiveness of a new cognitive-behavioral therapy (CBT) mobile app for reducing anxiety. She implements a pretest-posttest nonequivalent groups design by recruiting participants from two existing outpatient clinics: Clinic A (where patients use the app) and Clinic B (where patients receive standard care without the app). Both clinics measure anxiety levels at the start of the study (pretest) and six weeks later (posttest).
Which of the following outcomes would provide the strongest evidence that the app caused a reduction in anxiety, while accounting for potential maturation effects?
A developmental psychologist evaluates a new reading intervention across two different schools using a pretest-posttest nonequivalent groups design. Match each hypothetical pattern of results (from pretest to posttest) with the most accurate analytical interpretation of what the pattern indicates about the treatment's effectiveness or potential threats to internal validity.
A clinical psychology researcher uses a pretest-posttest nonequivalent groups design to evaluate a new mindfulness app. Clinic A (treatment group) and Clinic B (nonequivalent control group) are measured on stress levels at baseline (pretest) and after six weeks (posttest).
Results:
- Clinic A (App): Pretest Mean = , Posttest Mean = (reduction of points)
- Clinic B (Control): Pretest Mean = , Posttest Mean = (reduction of points)
Evaluate the following three interpretations of these results. Arrange them in order from the MOST methodologically sound (Order 1) to the LEAST methodologically sound (Order 3).
Learn After
When using a pretest-posttest nonequivalent groups design to evaluate a new teaching method across two different classrooms, what remains a primary concern regarding potential confounding variables?
In a study evaluating a new method for teaching fractions by comparing two different third-grade classrooms, match each component of the research design with its role or description.
A researcher is evaluating a new 'Fraction Pizza' teaching tool using two existing third-grade classrooms. To improve upon a posttest-only comparison, the researcher decides to measure and compare student improvement from a baseline. Arrange the following steps in the correct chronological order to properly execute this research approach.
In the fraction teaching example, if a researcher finds that the treatment group improved by 30 points while the control group improved by only 5 points, they can definitively conclude that the 25-point difference was caused by the new teaching method because the pretest scores were used to account for initial differences in ability.
Imagine you are an instructional designer tasked with constructing a research study to evaluate a new 'Fraction Pizza' software using two existing third-grade classrooms. To synthesize a plan that improves upon a posttest-only approach by comparing the magnitude of improvement across the two classrooms, which combination of research steps should you propose?
In the teaching fractions example of a pretest-posttest nonequivalent groups design, the control classroom only takes the final posttest, while the treatment classroom takes both the baseline pretest and the final posttest.
In the fraction teaching study, a researcher concludes that the new instructional method is the sole reason for the treatment group's higher scores. To critically evaluate the validity of this claim, the researcher must identify that _____, such as differences in teaching styles, remain as plausible alternative explanations for the observed improvement.
When evaluating a new fraction teaching method using two intact third-grade classrooms, researchers administer a baseline test and a final test so they can compare the pretest-to-posttest score _____ across the two groups rather than relying on a posttest-only comparison.
A researcher evaluates a new fraction learning method using two intact third-grade classes. Classroom A uses the new method, while Classroom B continues using their traditional textbook. Both classrooms take a math test in September and a final test in December. The researcher notes that Classroom A has a highly enthusiastic teacher, unlike Classroom B. Match each element of this scenario to its corresponding role in a pretest-posttest nonequivalent groups design.
A researcher is deconstructing the logical framework of a study evaluating a new fraction teaching method with a pretest-posttest nonequivalent groups design. Arrange the following analytical steps in the logical progression that demonstrates why this design is used, how its data is interpreted, and what limitations remain.