Question: An experiment is designed to test the "bystander effect" – the tendency of a person to respond to an emergency more slowly if other people are present. Thirty students from a social psychology class are equally and randomly assigned to one of two treatment conditions. In condition A, a student is asked to fill out a questionnaire in a small room by him- or herself. After 5 minutes, artificial smoke is piped under the door of the room, and the student is timed to see how long it takes him or her to respond to the "emergency". In condition B, a student is asked to fill out a questionnaire in a room in which 3 other students (confederates of the experimenter) are seated. Again, artificial smoke is piped under the door and the participant’s reaction is recorded. From the following data, compute a t score and test it for significance.

• Condition A: N=15, ΣX=1,695, ΣX ² =250,685
• Condition B: N=15, ΣX=3,645, ΣX ² =975,335

If you reject the null hypothesis, tell what it means in the context of the problem.

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