23 Jul WHAT PERCENT OF WHITES DRIVING AT NIGHT ARE DRIVING DRUNK?
Consider a town with a population that is 15 percent black and the remainder is white. Because black Show more Consider a town with a population that is 15 percent black and the remainder is white. Because blacks are more likely to work the night shifts 25 percent of all cars driven in that town at night are driven by blacks. One out of every 10 people driving at night is drunk regardless of skin color. Persons who are not drunk never swerve their car but 20 percent of all drunk drivers regardless of color swerve their cars. On a typical night 6000 cars are observed by the police. a) What percent of blacks driving at night are driving drunk? What percent of whites driving at night are driving drunk? b) Of the 6000 cars observed how many are driven by blacks? How many of these cars are driven by a drunk? Of the 6000 cars observed at night how many are driven by whites? How many of these cars are driven by a drunk? What percent of nighttime drunk drivers are black? c) The police chief believes the drunk-driving problem is mainly due to black drunk drivers. He orders his policemen to pull over all swerving cars and one in every two non-swerving cars that is driven by a black person. The driver of a non-swerving car is then given a breathalyzer test that is 100 percent accurate in diagnosing drunk driving. Under this enforcement scheme what percent of people arrested for drunk driving will be black? d) What is the main conclusion you derive after answering this question? Show less
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