Recall the previous exercises about social norms. Data were also collected on whether the experimenter was walking at a slow speed or was walking at a fast speed and are given in the data fi le SocialNormsSpeed. Is there an association between whether you collide with oncoming pedestrians and your speed, as measured by the speed of experimenter and whether the experimenter was in a collision?

a. State the appropriate null and alternative hypotheses in the context of the study.

b. Choose either a simulation-based approach or a theory-based approach to test your hypotheses from part (a).

• If you have chosen to use a theory-based approach, be sure to explain why you think this is a valid approach. That is, state the validity conditions and explain how you are deciding whether or not these conditions are met.

• Analyze the data using technology (either an applet or statistical soft ware). Be sure to report the following: the name of the statistic you are using and its value (from the study) and the p value.

• State your conclusion in the context of the study.

Data from previous exercise

What happens when you break social norms? Pedestrians walking on sidewalks typically follow the same traffic patterns as cars driving in the streets. What happens if you walk on the wrong side of the sidewalk? Do sex, location, and speed of walker affect the number of people in the oncoming traffic that run into you? Data were collected using both a male experimenter and a female experimenter and are given in the data file SocialNormsSex.