Which of the following factors was NOT necessary to ensure the internal validity of the Latané and Darley "seizure" study described in the text? They

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Asking participants about their knowledge of epilepsy before beginning the experiment was not necessary to ensure internal validity. The key factors that were necessary were ensuring that conditions varied on only the key variable, ensuring that the seizure overheard by participants was identical for everyone, and randomly assigning participants to groups or conditions. These measures help control for extraneous variables and increase the likelihood that any observed effects are due to the manipulation of the key variable.

Which of the Following Factors Was NOT Necessary to Ensure