History as a Threat to Internal Validity
In research design, history serves as an alternative explanation for changes in a dependent variable, representing a significant threat to internal validity. This threat occurs when extraneous external events happen between the pretest and posttest measurements, unintentionally causing a shift in the participants' scores. For instance, if an anti-drug education program is being evaluated, an unexpected and highly publicized celebrity drug overdose occurring during the study period could independently influence participants' attitudes, confounding the results and making it impossible to determine if the education program was the true cause of the change.
0
1
Tags
KPU
Research Methods in Psychology - 4th American Edition @ KPU
Related
History as a Threat to Internal Validity
Maturation as a Threat to Internal Validity
Testing as a Threat to Internal Validity
Instrumentation as a Threat to Internal Validity
Spontaneous Remission
Confounding Variable
What is the primary focus of internal validity in an experiment?
In a study comparing two different teaching methods, if the group receiving Method A also happens to be more naturally motivated than the group receiving Method B, the study would be described as having high internal validity.
A researcher is investigating whether a new 'Mindfulness App' reduces stress. Match each of the researcher's design decisions to the specific way it protects the study's internal validity.
A researcher finds that a 'Brain Training' app improves memory scores. However, the app group was paid $50, while the control group was paid $0. Arrange the following steps to reflect a logical analysis of the study's internal validity.
A researcher reports that a new meditation program reduces anxiety by more than a control group. However, an external reviewer discovers that the meditation group also attended weekly support meetings that the control group did not. The reviewer concludes that the study's findings are compromised because this lack of control over extraneous variables directly undermines the study's ______ validity.
The degree to which an experiment ensures that any systematic changes in the outcome () are wholly due to the manipulation of the influence factor () is known as ______ validity.
In psychological research, internal validity is considered 'high' only when the researcher can confidently conclude that:
A researcher conducts an experiment to test if a new memory technique (influence ) improves test scores (outcome ). If the experiment is designed such that any systematic changes in test scores are wholly due to the new memory technique, the study would be applied as having high internal validity.
Match each component of an experimental design with the appropriate description to analyze how it relates to the study's internal validity.
Arrange the following steps in a logical sequence to evaluate whether a study's claims of causality are supported by its internal validity.
In the context of psychological research, defining and protecting internal validity is crucial for establishing cause-and-effect relationships. Explain the core requirement for an experiment to have high internal validity, and list at least four specific threats to internal validity that can prevent a researcher from confidently concluding that influence X caused outcome Y.
Based on the definition of internal validity, explain why the researcher cannot confidently conclude that the digital attention exercise (X) caused the improvement in focus scores (Y). Identify at least two specific threats to internal validity present in this scenario and describe how they act as alternative explanations.
A clinical researcher wants to test whether a new therapy technique (influence X) reduces clinical depression symptoms (outcome Y). Apply the concept of internal validity to propose one concrete design decision that would ensure that any systematic changes in depression symptoms are wholly due to the therapy (influence X) rather than the natural improvement of participants over time (spontaneous remission).
Interrupted Time-Series Design
Control Group in Pretest-Posttest Designs
History as a Threat to Internal Validity
Maturation as a Threat to Internal Validity
Testing as a Threat to Internal Validity
Instrumentation as a Threat to Internal Validity
Regression to the Mean as a Threat to Internal Validity
Spontaneous Remission
Example of a One-Group Pretest-Posttest Design
Why is it difficult to conclude with certainty that a treatment was effective when using a one-group pretest-posttest design?
A researcher is using a one-group pretest-posttest design to study the effect of a new stress-reduction workshop on college students. Match each component of the study to its specific role in this research design.
A health psychologist wants to evaluate the impact of a weekend nature retreat on stress levels using a one-group pretest-posttest design. Arrange the steps of this study in the correct chronological order.
A researcher evaluates a new study-skills workshop using a one-group pretest-posttest design and observes a significant increase in students' grade point averages at the end of the semester. The researcher can definitively conclude that the workshop caused the increase because the pretest measurement successfully accounts for each participant's individual academic history.
Which of the following describes the basic procedure used in a one-group pretest-posttest design?
A researcher evaluates a new social-anxiety intervention using a one-group pretest-posttest design and finds that participants' anxiety levels are lower at the posttest than they were at the start. When appraising the scientific merit of the claim that 'the intervention caused the change,' a peer reviewer would note that the lack of a comparison group makes it impossible to rule out threats like maturation or history. Consequently, in terms of research design standards, this study is evaluated as having critically low _____ validity.
When using a one-group pretest-posttest design to evaluate a new mindfulness intervention, the researcher uses the pretest to establish a(n) _____ for participants' stress levels before the intervention occurs.
A researcher evaluates a new math tutoring software using a one-group pretest-posttest design. To control for potential order effects, the researcher can counterbalance the study by having half of the participants take the posttest exam before they use the tutoring software.
Analyze the structural differences between a within-subjects experiment and a one-group pretest-posttest design. Match each design characteristic to the research design or feature it describes.
An educational psychologist wants to evaluate the effectiveness of a new reading intervention using a one-group pretest-posttest design. Arrange the steps of the research process and the subsequent evaluation of its findings in the correct chronological and logical order.
Learn After
Control Group in Pretest-Posttest Designs
In the context of research design, which of the following best defines 'history' as a threat to internal validity?
A history threat to internal validity refers to the possibility that participants' personal backgrounds and past experiences before entering a study caused the observed changes in the dependent variable.
A researcher is conducting a study to see if a new campus security escort service improves students' feelings of safety. Match each element of the research design with the specific event from the scenario that illustrates how a history threat could occur.
A researcher is evaluating a new campus safety program using a pretest-posttest design. Arrange the following events and analytical steps in the correct order to demonstrate how a history threat is identified and evaluated in this research scenario.
Imagine you are designing a research protocol to evaluate the impact of a new 'Social Connectivity' program on elderly residents in a specific city. During your planning, you realize that the city is likely to implement a new 'Free Senior Transit' policy halfway through your -month study—an external event that could independently influence residents' social scores. To construct a research design that effectively isolates the program's unique impact from the influence of this external transit policy, which of the following strategies should you formulate?
A researcher is critiquing a study that reported a increase in gym attendance following the introduction of a new campus fitness program. However, they discover that a highly popular 'New Year's Resolution' social media challenge began nationwide at the exact same time the program started. By judging that this external social trend, rather than the fitness program itself, is the most plausible explanation for the change in behavior, the researcher has identified a(n) _____ threat to internal validity.
In research methodology, an extraneous external event that occurs between the pretest and posttest measurements and provides an alternative explanation for the results is known as a(n) _____ threat to internal validity.
A researcher evaluates a new anti-drug education program using a one-group pretest-posttest design. Between the pretest and posttest measurements, a highly publicized celebrity drug overdose occurs. If the researcher observes a positive change in the participants' attitudes toward avoiding drugs at the posttest, they can confidently conclude that the anti-drug program was the sole cause of this change.
In a study designed to evaluate an anti-drug education program, several events and concepts interact. Match each component of this research scenario with its methodological description.
To evaluate whether history poses a threat to the internal validity of a one-group pretest-posttest study, order the chronological events and evaluation steps from first to last.
Describe the concept of 'history' as a threat to internal validity. In your explanation, define what history threats are, specify when they must occur relative to the study's measurements, and explain how they impact the interpretation of changes in the dependent variable.
Based on this scenario, diagnose why the celebrity drug overdose constitutes a history threat to internal validity. How does this event compromise the researchers' ability to evaluate the anti-drug program's effectiveness?
A researcher plans to evaluate a new psychology teaching method using a one-group pretest-posttest design, but is concerned that external campus events during the semester will act as a history threat. What design modification should they apply to control for this threat, and why does this modification work?