Instrumentation as a Threat to Internal Validity
Instrumentation threatens a study's internal validity when the fundamental characteristics of the measuring instrument or process change between the pretest and posttest. This issue frequently arises in observational studies where human observers are used to measure behavior, as they may gradually gain skill, become fatigued, or unconsciously alter their evaluation standards over time. Additionally, instrumentation effects can manifest when the participants themselves change their approach to the measurement tool, such as taking a survey very seriously during the novel pretest but becoming bored and less careful with their responses during the posttest.
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Research Methods in Psychology - 4th American Edition @ KPU
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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.
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
Strengths of Switching Replication
Which of the following best describes how instrumentation threatens a study's internal validity?
An instrumentation threat can occur even if the measurement process becomes more accurate over time, such as when a researcher gains skill in coding behaviors between the pretest and the posttest.
A clinical psychologist is conducting a six-month study on the effects of a new therapy. Match each scenario occurring between the pretest and posttest to the specific way it functions as an instrumentation threat to internal validity.
A developmental psychologist is studying the impact of a 'kindness curriculum' on playground behavior. Analyze how an instrumentation threat leads to a false conclusion by ordering the events of the study from the initial measurement to the final logical error.
An instrumentation threat to internal validity can occur if participants change their approach to a measurement tool, such as becoming bored or less careful with their responses, between the pretest and the posttest.
A developmental psychologist measures 'cooperative play' in toddlers using a specific behavioral checklist. If the psychologist becomes significantly more skilled at spotting these behaviors by the time of the posttest, the resulting data suffers from an instrumentation threat because:
A senior researcher is evaluating a peer's study on classroom aggression. They notice that the observers were extremely strict during the pretest but became fatigued and more lenient by the posttest, leading to a recorded 'decrease' in aggression that likely does not exist. The researcher rejects the study's conclusions, judging that the measurement standards shifted over time. To justify this critique of the study's internal validity, the researcher would cite a(n) _____ threat.
A clinical psychologist is evaluating a new mindfulness program and administers a psychological survey before and after the intervention. Match each scenario describing a change in the measurement process to the type of instrumentation threat it represents.
An educational psychologist measures classroom engagement. In the pretest, the observers are fresh and strict, but in the posttest, they are tired and lenient, which changes the measurement standards. In this research design, the internal validity is compromised specifically by the threat of _____.
A researcher is evaluating a school program. Order the events to show how an undetected instrumentation threat leads a researcher to draw an invalid evaluative conclusion about a program's effectiveness.