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. The following is an excerpt from a summary table created based o of the data collected as part of this project.

(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 dierent races. In this analysis, which variable would be the response variable and which variable would be the explanatory variable?

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State Arizona Apaice County Arizona Apaice County Arizona Cochise County Arizona Cochise County Arizona Cochise County Arizona County Apaice County Wood County Wood County Wood County Driver's race Black Hispanic White Black Hispanic White Wisconsin Wisconsin Wisconsin White Black Hispanic No. of stops per year 266 1008 6322 1169 9453 10826 16 27 1157 % of stopped cars searched 0.08 0.05 0.02 0.05 0.04 0.02 0.24 0.04 0.03 drivers arrested 0.02 0.02 0.01 0.01 0.01 0.01 0.10 0.03 0.03