Cook County, Illinois, has the second-largest population of any county in the United States (after Los Angeles County, California). Cook County has 30 suburban townships and an additional eight townships that make up the city of Chicago. The suburban townships are

Barrington Berwyn Bloom Bremen Calumet Cicero

Elk Grove Evanston Hanover Lemont Leyden Lyons

Maine New Trier Niles Northfield Norwood Park Oak Park

Orland Palatine Palos Proviso Rich River Forest

Riverside Schaumburg Stickney Thornton Wheeling Worth

The Chicago townships are

Hyde Park Jefferson

Lake Lake View

North Chicago Rogers Park

South Chicago West Chicago

Because city and suburban areas may differ, the first stage of a multistage sample chooses a stratified sample of four suburban townships and two of the more heavily populated Chicago townships. Use software, the Simple Random Sample applet, or Table B to choose this sample. (If you use Table B, assign labels in alphabetical order and start at line 118 for the suburbs and at line 127 for Chicago.)