A recent survey of all auto accident victims in Dole county found that, if the severely injured drivers and front-seat passengers, 80 percent were not wearing seat belts at the time of their accidents. This indicates that by wearing seat belts, drivers and front-passengers can greatly reduce their risk of being severely injured if they are in an auto accident.
The conclusion above is not properly drawn unless which of the following is true?
1 .Of all the drivers and front-seat passengers in the survey more than 20 percent were wearing seat bells at the time fo their accidents.
2. considerably more than 20 percent of drivers and front-passengers in Dole county always wear seat belts when traveling by car.
3. More than half of the drivers and front-passengers in the survey were not wearing the seat belts at the time of their accidents.
