In a new police program, automobile owners in some neighborhoods whose cars are not normally driven between 1 A  M  and 5 A  M  can display a special decal in the cars' windows and authorize police to stop the cars during those hours to check the drivers' licenses
The theft rate for cars bearing such decals is much lower than had been usual for cars in those neighborhoods
Are the neighborhoods in which the program has been put into effect a representative cross section of neighborhoods with respect to the types of automobiles owned by residents.