A student is investigating the bystander effect and receives permission to conduct the study in the school cafeteria. What is a potential dependent variable that can be measured by the student?

• A. The time of day that the experiment is carried out.
• B. The number of people present in the cafeteria.
• C. The amount of time a student takes to assist another student in distress.
• D. The temperature in the cafeteria.

Answer: (C)

The dependent variable in an experiment is the outcome that is measured to assess the effect of the independent variable. In the context of investigating the bystander effect, the student aims to understand how the presence of others influences an individual's likelihood to help someone in need.

In this scenario, the amount of time a student takes to assist another student in distress serves as a direct measure of this effect. It captures the core aspect of the bystander effect—whether individuals are more or less likely to intervene based on the number of people present. A longer response time may indicate the presence of bystanders leading to inaction, whereas a shorter response time could suggest that fewer bystanders promote helping behavior.

The other options do not directly assess the helping behavior related to the bystander effect. The time of day when the experiment is conducted may influence behavior indirectly but isn't a measure of the response to a distressful situation. The number of people present may set the stage for the experiment but does not provide a measure of intervention behavior itself. Similarly, the temperature in the cafeteria is irrelevant to the helping behavior being studied. Thus, the amount of time taken to provide assistance effectively captures the dependent variable in this investigation of the bystander effect.