A law enforcement agent believes that 80% of the drivers stopped on Saturday nights for speeding are under the influence of alcohol. Suspecting that the proportion under the influence may be higher...

A law enforcement agent believes that 80% of the drivers stopped on Saturday nights for speeding are under the influence of alcohol.  Suspecting that the proportion under the influence may be higher than 80%, a SRS of 140 drivers who were stopped for speeding on a Saturday night was taken.  119 of the drivers in the sample were under the influence of alcohol.

What is the conclusion, and why?