Stanford Open Policing. The Stanford Open Policing project gathers, analyzes, and releases records from traffic stops by law enforcement agencies across the United States. Their goal is to help researchers, journalists, and policymakers investigate and improve interactions between police and the public.36 The following is an excerpt from a summary table created based off of the data collected as part of this project.
Driver’s No. of stops % of stopped County State race per year cars searched drivers arrested
Apaice County Arizona Black 266 0.08 0.02 Apaice County Arizona Hispanic 1008 0.05 0.02 Apaice County Arizona White 6322 0.02 0.01 Cochise County Arizona Black 1169 0.05 0.01 Cochise County Arizona Hispanic 9453 0.04 0.01 Cochise County Arizona White 10826 0.02 0.01 · · · · · · · · · · · · · · · · · · Wood County Wisconsin Black 16 0.24 0.10 Wood County Wisconsin Hispanic 27 0.04 0.03 Wood County Wisconsin White 1157 0.03 0.03
(a) What variables were collected on each individual traffic stop in order to create to the summary table above?
(b) State whether each variable is numerical or categorical. If numerical, state whether it is continuous or discrete. If categorical, state whether it is ordinal or not.
(c) Suppose we wanted to evaluate whether vehicle search rates are different for drivers of different races. In this analysis, which variable would be the response variable and which variable would be the explanatory variable?
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