In Guéguen and de Gail's field experiment on helping behavior, why did the researchers use strict, predetermined selection rules when approaching supermarket shoppers?

Arrange the steps used by researchers Guéguen and de Gail to select and include participants in their supermarket field experiment in the correct order.

In Guéguen and de Gail's field experiment on helping behavior, researchers followed strict rules to select participants and minimize bias. Imagine you are a researcher in this study. Match each shopper scenario with the correct action you should take according to the study's predetermined selection rules.

In Guéguen and de Gail's field experiment, the implementation of strict selection rules (such as the 'gaze back' requirement) was necessary to ensure that helping behavior was a response to the confederate's smile rather than a result of the researcher subconsciously choosing more helpful-looking participants.

When evaluating the methodology of Guéguen and de Gail's field experiment, the implementation of rigid selection criteria—such as only approaching shoppers between the ages of $20$ and $50$ who gazed back—was a critical safeguard intended to prevent _____, which could occur if a confederate subconsciously chose participants who appeared more likely to help.

Suppose you are designing a field experiment to test how social cues affect prosocial behavior, following the rigorous methodology used by Guéguen and de Gail to minimize experimenter bias. Arrange the following procedural components into a scientifically sound protocol that standardizes participant selection and engagement.

In Guéguen and de Gail's field experiment on helping behavior, any shopper who was the first person encountered on the stairway appearing to be between the ages of $20$ and $50$ automatically became a participant in the study.

In Guéguen and de Gail's field experiment, what was the primary methodological purpose of having the confederate drop computer diskettes?

In Guéguen and de Gail's field experiment on helping behavior, analyze the methodological role of each experimental component by matching it to its corresponding implementation or purpose in the study's design.

When evaluating the methodology of Guéguen and de Gail's field experiment, the implementation of rigid participant criteria—such as only selecting shoppers between the ages of $20$ and $50$ who gazed back—was a critical design choice used to prevent unintentional _____ when selecting participants.

Recall and state the specific, predetermined selection rules used by Nicolas Guéguen and Marie-Agnès de Gail to identify participants in their supermarket field experiment. What specific threat to validity did these rules aim to prevent?

Explain why this protocol fails to meet the methodological standards established by Guéguen and de Gail. What specific threat to internal validity is introduced, and why does it compromise the conclusion?

Imagine you are designing a field experiment to test if wearing a clean lab coat increases helping behavior (such as picking up dropped pens) in a library. Apply the logic of Guéguen and de Gail's selection rules to write a three-step selection protocol that your confederate must follow to choose participants without selection bias.