If a study follows the notation $R$ $X$ $O$ and $R$ $O$, identify the design type and the purpose of $R$.

This is a Posttest-Only Control Group Design . The $R$ stands for random assignment , which is critical to ensure that participant characteristics are distributed equally across groups, thereby minimizing selection bias.

Determine how to mathematically represent a pretest-posttest control group design using standard experimental notation.

The notation for this design is: Group 1: $R$ $O_1$ $X$ $O_2$ Group 2: $R$ $O_1$ $O_2$ This design allows researchers to account for baseline differences using the initial observation $O_1$.

An experimenter finds a result, but a participant realizes the hypothesis and changes their behavior to 'help' the researcher. Identify this threat to internal validity .

This is a result of demand characteristics . Participants infer the purpose of the study and alter their performance, which undermines the study's construct validity.

When a researcher uses a $1-9$ Likert scale to verify that a film successfully induced 'fear' before measuring the dependent variable, what is the procedure called?

This is a manipulation check . It is used to ensure that the independent variable ($X$) had the intended psychological effect on participants before attributing any change in the dependent variable to that manipulation.

Explain the third variable problem in the context of why $r = 0.85$ does not prove causality.

A strong correlation between variables $A$ and $B$ does not imply causation because a hidden third variable ($C$) may be influencing both. Experimental design using random assignment is required to control for these potential confounding variables.

Differentiate between a mediating variable and a moderating variable in a research hypothesis.

Mediating variable : Explains the 'how' or 'why' mechanism connecting the independent and dependent variables. Moderating variable : Influences the 'when' or 'for whom' the relationship between variables exists, essentially acting as a boundary condition.

In the context of internal validity, define statistical regression (regression to the mean).

Statistical regression occurs when participants are selected based on extreme scores. On subsequent testing, their scores tend to move closer to the population mean regardless of any experimental treatment, creating a false impression of an intervention effect.

Why is the Solomon Four-Group Design considered the most robust method for controlling pretest sensitization ?

It combines the posttest-only and pretest-posttest designs. By including groups that do not receive a pretest ($O_1$), researchers can statistically isolate and quantify the effect of the pretest itself on the final outcome ($O_2$).

If a study has a high experimental mortality rate, how does this specifically threaten internal validity?

Experimental mortality (attrition) threatens validity if participants drop out of one condition at a higher rate than another. If the remaining participants are systematically different from those who left, the final comparison between groups is no longer equivalent.

According to Karl Popper , what is the primary criterion for a theory to be considered 'scientific'?

Falsifiability . For a theory to be scientific, it must be stated in a way that allows it to be proven false through empirical observation. If no observation can refute a claim, it lacks scientific demarcation.

Describe the selection-maturation interaction threat to internal validity.

This occurs when participants in different groups are at different stages of maturation at the start of the study. Even without an experimental intervention, the groups would change at different rates, potentially masking or exaggerating the effects of the treatment.

How do cover stories function to reduce bias in psychological research?

Cover stories are deceptive scenarios presented to participants to disguise the true purpose of the research. This prevents participant bias and demand characteristics , as participants are unaware of the specific hypothesis being tested.

Classify the following approach: A researcher records the frequency of aggressive outbursts on a playground without intervention.

This is a descriptive research strategy . Its primary function is the systematic recording of behavior as it naturally occurs, without attempting to manipulate variables or establish causal relationships.

Define the relationship between reliability and validity in measurement.

Reliability refers to the consistency of a measure (e.g., test-retest stability), while validity refers to the accuracy of the measure in assessing the intended construct. A measure can be reliable without being valid, but it cannot be truly valid without first being reliable.

What are the 4 Idols identified by Francis Bacon that contribute to bias in human judgment?

The four idols are: Idols of the Tribe (human nature flaws) Idols of the Cave (individual bias) Idols of the Market-Place (misuse of language) Idols of the Theatre (dogmatic philosophical systems)

Foundational Principles Of Scientific Inquiry And Experimental Research Methods Flashcards

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Foundational Principles of Scientific Inquiry and Experimental Research Methods

This deck explores the philosophy of science, research design, validity, and the practical application of experimental methodology in psychology.

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by @nataly_morales

Q: If a study follows the notation $R$ $X$ $O$ and $R$ $O$, identify the <strong>design type</strong> a...

Q: Determine how to mathematically represent a <strong>pretest-posttest control group design</strong> u...

Q: An experimenter finds a result, but a participant realizes the hypothesis and changes their behavior...

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