An experiment was conducted in 1969 to test whether being in the presence of strangers affect how long it will take someone to go to the aid of another stranger in distress. In this experiment, each subject was left in a waiting room either alone, with 2 strangers present, or with 4 strangers present. A researcher would pretend to suffer an ankle injury in the room next door and call out for help. (Reference Number: 7198) The amount of time it took (in seconds) for each subject to come to the aid of the researcher was recorded, and the results are below: Treatment Group Number of Strangers x s n 1 0 25.8 5.47 4 2 2 32 4.41 6 3 4 39.5 4.89 6 a. We would like to compute an ANOVA test for the difference in group means between treatment groups 1, 2, and 3. What is the null hypothesis? H0: 1 = 2 = 3 H0: 1 - 2 - 3 = 0 H0: 1 = 2 = 3 = 0 H0: 1 = 2 H0: 1 - 2 = 0