Maturation as a Threat to Internal Validity
Maturation is a threat to internal validity that occurs when participants undergo natural developmental or physiological changes—such as growing older, learning, or becoming fatigued—between the pretest and posttest measurements of a study. These natural, ongoing changes, rather than the experimental treatment itself, may be the actual cause of any observed differences in the dependent variable over time. For example, over the course of a year-long intervention, children naturally become better reasoners, which could be misconstrued as an effect of the intervention.
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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 maturation as a threat to internal validity?
If an observed difference in a study's dependent variable is actually due to participants naturally growing older, learning, or becoming fatigued between measurements, this represents a maturation threat.
A researcher is concerned that maturation is threatening the internal validity of their study. Match each research scenario with the specific type of natural, internal change that is likely influencing the results.
A researcher evaluates a year-long logic intervention for children and finds that their reasoning scores improved significantly. Arrange the steps the researcher should follow to analyze whether this finding is actually due to the intervention or represents a maturation threat.
You are designing a research project to evaluate whether a new 12-month 'Early Literacy' program increases the reading readiness of toddlers. Given that toddlers' reading readiness naturally improves as they mature cognitively over a year, which of the following research plans should you construct to ensure that any observed improvement is due to the program rather than natural maturation?
A researcher concludes that a full-day intensive workshop decreased participants' focus because their test scores were lower at 5:00 PM than they were at 9:00 AM. A colleague argues that participants likely just became naturally tired over the course of the day—not because of the workshop. This alternative explanation is an example of the internal validity threat known as _____.
In psychological research, the threat to internal validity that occurs when participants undergo natural developmental or physiological changes—such as growing older, learning, or becoming fatigued—between pretest and posttest measurements is known as _____.
A researcher evaluates a 10-hour intensive study session by testing students' focus at 9:00 AM (pretest) and again at 7:00 PM (posttest). If the researcher concludes that the study session itself caused a decrease in focus, but the decline was actually due to the students naturally becoming tired, the internal validity of the study is threatened by maturation.
A researcher is analyzing different potential explanations for changes observed between pretest and posttest in a study. Match each description of a participant's change with the specific maturation-related threat it represents.
Arrange the steps a researcher should take to evaluate and control for a potential maturation threat in a pretest-posttest design.