Traffic Safety: Here is a passage from a study published by the National Highway Traffic Safety Administration in 2007.
"The National Occupant Protection Use Survey (NOPUS) is the only probability-based survey of driver cell phone use in the United States. The survey observes usage as it actually occurs at a random selection of roadway sites, and so provides the best tracking of the extent to which people in this country are using cell phones while driving."
NOPUS observed 43,000 drivers in this study.
What population is the focus of this study?
A. drivers in the U. S.
B. drivers in the U. S. who use cell phones while driving
C. the 43,000 drivers observed in the study
A. drivers in the U. S.

Which is the best conclusion that can be drawn regarding the status of african-americans in the south in the late 1800s? a) african-americans made tremendous political, social, and economic advancements during the reconstruction era. b) passage of the 13th, 14th, and 15th amendments to the u. s. constitution guaranteed equal status and rights for all african-americans. c) the reconstruction policies enacted by the federal government were highly effective in african-american citizens transition to life after slavery. d) although african-americans had equal rights under federal law they were still economically, politically, and socially inferior to whites in the south during the reconstruction era.