Example of Causal Limitations: Private Body Consciousness and Moral Judgments

Example of Causal Limitations in a Non-Experimental Factorial Design

Why are findings related to a non-manipulated independent variable, such as a personality trait, considered strictly correlational even when included in an experimental study?

In a psychology study that includes both manipulated and non-manipulated factors, the conclusions a researcher can draw depend on how each variable is handled. Match each concept with its role in determining whether a relationship is causal or correlational.

A researcher conducts an experiment where participants are randomly assigned to either a 'caffeine' or 'placebo' group to test reaction time. They also measure each participant's 'typical hours of sleep.' The results show that caffeine improves reaction time and that people who sleep more also have faster reaction times. Based on this study, the researcher is justified in concluding that getting more sleep caused the faster reaction times.

A researcher conducts a study and finds that participants with high 'Trait Anxiety' (a non-manipulated variable) report significantly higher levels of social stress. To evaluate the causal status of this finding, arrange the following analytical steps in the correct logical order, from the initial observation to the final determination of causal validity.

In experiments that utilize both manipulated and non-manipulated independent variables, researchers can draw causal conclusions regarding both variables as long as they are studied within the same experimental design.

In an experiment that includes both a manipulated independent variable and a non-manipulated independent variable, why must researchers restrict their causal conclusions strictly to the manipulated factor?

A researcher investigates how 'Caffeine Intake' (a manipulated factor) and 'Introversion' (a non-manipulated participant variable) affect memory performance. The researcher concludes that being an introvert 'caused' the participants to remember more words. To evaluate the scientific validity of this causal claim, a peer reviewer must identify that the relationship between the participant variable and memory is strictly _____ because the researcher did not utilize random assignment for that factor.

A researcher designs a factorial study in which participants are randomly assigned to either a clean or a messy room (manipulated variable) and are also grouped by their private body consciousness score from a self-report questionnaire (non-manipulated variable). Both factors are used to predict the harshness of participants' moral judgments. Apply the principle of causal limitations by matching each element of this study to its correct methodological role or permitted conclusion.

A researcher runs a factorial experiment in which participants are randomly assigned to either a distracting or a quiet work environment (manipulated independent variable), and each participant's level of trait anxiety is measured with a validated questionnaire before the task begins (non-manipulated independent variable). After analyzing the results, the researcher observes that high-trait-anxiety participants performed significantly worse on the task than low-trait-anxiety participants. A classmate reviewing the study correctly argues: 'Even though the anxiety difference in performance is statistically significant, the researcher is not justified in concluding that trait anxiety _____ task performance, because participants were not randomly assigned to anxiety levels, and an unmeasured third variable could account for both the higher anxiety scores and the lower performance scores.'

A researcher publishes a factorial study in which participants are randomly assigned to receive either positive or neutral performance feedback (manipulated), and their scores on a 'need for cognition' scale are used to classify them as high or low (non-manipulated). The study finds that high-need-for-cognition participants generated significantly more creative solutions than low-need-for-cognition participants. The researcher concludes: 'Need for cognition caused greater creative output.' Arrange the following steps in the order a critical peer reviewer should apply them to evaluate the validity of that causal claim.

In experiments that utilize both manipulated and non-manipulated independent variables, why are researchers restricted to drawing causal conclusions only about the manipulated variable? Describe the primary methodological reason and the resulting nature of the findings for the non-manipulated variable.

Analyze this research scenario to explain which findings can support causal claims and which cannot. Justify your answer by explaining the differences in participant assignment and control between the two independent variables.

An experimenter tests whether a new memory-training technique (manipulated, with random assignment) and a participant's age (non-manipulated) affect recall ability. They discover that older participants perform worse on the recall task. Can they conclude that aging causes a decline in recall ability based on this study? Explain in one to three sentences.