Final answer:
Driver error, including that caused by alcohol intoxication, is responsible for a significant percentage of fatal car crashes. Studies and devices like the Breathalyzer are used to measure driver intoxication levels and their correlation with crashes. Alcohol intoxication is a major factor, with legal thresholds commonly set at a BAC of 0.08%.
Step-by-step explanation:
The question asks for clarity on the percentages of fault found in car crashes and similar incidents caused by intoxicated drivers. According to the American Automobile Association, driver error is the cause of approximately 54% of all fatal auto accidents. When examining a sample of 30 fatal accidents, it was found that 14 were caused by driver error. To assess the accuracy of the AAA statistic, a hypothesis test could be conducted using a significance level (a) of 0.05. The Breathalyzer is used to measure ethanol concentration in breath, which reflects the blood alcohol level, with intoxication legally defined in many regions as a blood alcohol concentration (BAC) of 0.08% or higher. Alcohol intoxication, where legal limits are often surpassed, can significantly contribute to the proportion of car crashes. In the U.S., acute intoxication results in a substantial number of deaths yearly, both directly and indirectly. Therefore, the prevalence of alcohol-related incidents is a significant concern.