A social psychologist wants to determine if the number of bystanders present during an emergency affects how long it takes for an individual to help. The psychologist stages an emergency in a public space and systematically varies whether there are one, three, or ten other people present. The researcher then measures the time it takes for a participant to intervene and offer assistance. In this experiment, what is the dependent variable?

Example of an Experiment: Note-Taking Method and Learning Performance

Extraneous Variable

Time Series

Confounding Variable

Internal Validity

Null Result

Non-Experimental Research

In an experimental study, which of the following best describes the dependent variable?

In a psychological experiment investigating whether a new mnemonic technique improves memory recall, the students' memory recall scores represent the dependent variable.

Match each psychological research scenario with the specific dependent variable that would be measured to evaluate the presumed effect of the study's conditions.

A researcher investigates whether practicing mindfulness for ten minutes a day reduces anxiety scores on a standardized test. Arrange the logical steps for analyzing the role of the dependent variable in this investigation.

A researcher evaluates whether 'heart rate' or 'self-reported anxiety' is a more valid measure of the presumed effect in a study on stress. This judgment specifically addresses the quality and appropriateness of the ________ variable.

Suppose you are constructing an experimental protocol to investigate if 'ambient peppermint scent' improves 'cognitive focus' during a repetitive task. To create a valid dependent variable that measures the presumed effect of the scent, which of the following measurement strategies should you propose?

In a psychological experiment, the dependent variable is the factor that the researcher actively manipulates to determine its causal effect.

Match each core aspect of a dependent variable in a psychological experiment with the statement that best describes its function or behavior.

A researcher randomly assigns participants to either a quiet room or a noisy room and asks them to study a list of 30 vocabulary words for 10 minutes. Afterward, all participants complete a written recall test. The researcher records how many words each participant correctly recalled. In this experiment, the number of words correctly recalled is the _____, because it is the factor measured to evaluate whether the manipulation of the environmental condition produced a change.

A researcher proposes using 'number of errors made on a 10-minute proofreading task' as the dependent variable in a study on whether mental fatigue (induced by 60 minutes of continuous cognitive work) impairs attention. Arrange the following evaluative steps in the logical order a researcher should follow to determine whether this dependent variable is appropriate for the study.

Define a dependent variable in the context of an experimental study. In your explanation, identify what it represents in a causal relationship and describe how it is used by researchers in relation to the independent variable.

Explain how the concept of a dependent variable is demonstrated in this study. In your response, identify the specific dependent variable and explain why it is characterized as the presumed effect.

In an experiment testing the effect of sleep duration (4 hours vs. 8 hours) on cognitive processing speed, identify the dependent variable and state how the researcher applies it to evaluate the causal relationship.