Worksheet 01: Estimating Crime rates

Worksheet
Published

February 19, 2025

The Chicago database of crimes known to police between 2001 and 2019 at https://data.cityofchicago.org/ contained 7,048,107 records. To reduce the size of the data for performing analyses, an SRS of 5,000 records was drawn from the database and saved in file crimes.csv.

  1. What is the sampling weight for each record in the sample?

  2. What is the estimated percentage of crimes in which an arrest was made? Give a 95% CI.

  3. Estimate the total number of burglaries known to police between 2001 and 2019 (use variable crimetype to identify the burglaries), along with a 95% CI