Gangs and homemade weapons. The National Gang Crime Research Center (NGCRC) has developed a six-level gang classification system for both adults and juveniles. The six categories are shown in the accompanying table. The classification system was developed as a potential predictor of a gang member’s propensity for violence in prison, jail, or a correctional facility. To test the system, the NGCRC collected data on approximately 10,000 confined offenders and assigned each a score from the gang classification system.

(Journal of Gang Research, Winter 1997). One of several other variables measured by the NGCRC was whether the offender had ever carried a homemade weapon (e.g., knife)

while in custody. The data on gang score and homemade weapon are summarized in the table below. Conduct a test to determine whether carrying a homemade weapon in custody depends on gang classification score. (Use a = .01.) Support your conclusion with a graph.

Homemade Weapon Carried Gang Classification Score Yes No 0 (Never joined a gang, no close friends in a gang)

255 2,551 1 (Never joined a gang, 1–4 close friends in a gang)

110 560 2 (Never joined a gang, 5 or more friends in a gang)

151 636 3 (Inactive gang member) 271 959 4 (Active gang member, no position of rank)

175 513 5 (Active gang member, holds position of rank)

476 831