In Darley and Latané’s bystander experiment, what method was used to control for extraneous participant variables and ensure that the experimental groups were similar from the beginning?

Match each specific component of Darley and Latané's bystander experiment with the functional role it served in their experimental design.

In a study modeled after Darley and Latané’s bystander experiment, a researcher tests the 'one witness' condition in a small private office and the 'five witnesses' condition in a large public lecture hall. This researcher has successfully applied the principle of experimental control over extraneous variables.

Analyze the experimental logic of Darley and Latané's bystander study. Sequence the following components to reflect the logical progression of their research design, from the methods used to establish internal validity to the collection of data.

Imagine you are developing a new experimental design to test if the 'perceived age' of witnesses (e.g., child vs. adult) affects helping behavior. Following the specific methodology and controls used by Darley and Latané, which of the following research plans correctly constructs this new study?

In Darley and Latané's bystander experiment, the researchers held the simulated emergency constant for all participants to maintain experimental control.

In Darley and Latané's bystander study, the independent variable was manipulated to create conditions with different group sizes. Arrange these experimental conditions in order from the fewest perceived witnesses to the most.

A critic evaluating Darley and Latané's study argues that the results might be explained by differences in the 'types of people' who ended up in each group. This critique is invalid because the researchers employed _____, which ensures that participant variables are balanced across the conditions at the start of the study.

For each design feature in Darley and Latané's bystander experiment, match it to the specific threat to internal validity that it was designed to prevent. Answering correctly requires analyzing why each feature was necessary—that is, what confound or problem would arise if it were absent.

A researcher proposes modifying Darley and Latané's design by assigning participants systematically: the first 10 arrivals go to the one-witness condition, the next 10 to the two-witness condition, and the final 10 to the five-witness condition. A peer reviewer evaluates this proposal and concludes it _____ the study's internal validity, because arrival order may be confounded with time-of-day differences or personality traits of participants who tend to arrive early versus late, providing an alternative explanation for any observed group differences in helping behavior.

Based on the description of Darley and Latané's bystander experiment, identify the independent variable manipulated by the researchers, describe the three distinct conditions created, and state the two specific methods the researchers used to maintain experimental control.

Explain why this new study design fails to maintain the experimental control established in the original Darley and Latané experiment. In your answer, identify the two major control failures in the replication design compared to the original, and explain what extraneous variables are introduced as a result.

Imagine you are designing a new experiment to test if the type of simulated emergency (e.g., a physical fall vs. a fire alarm) affects helping behavior. Applying the control methods from Darley and Latané's study, how should you implement random assignment and hold extraneous variables constant in this new design?