Final answer:
Driver error is considered the single biggest contributor to crashes, according to the American Automobile Association (AAA). It is listed as the cause of approximately 54 percent of all fatal auto accidents.
Step-by-step explanation:
Driver error is considered the single biggest contributor to crashes, according to the American Automobile Association (AAA). It is listed as the cause of approximately 54 percent of all fatal auto accidents. In a study where 30 randomly selected fatal accidents were examined, it was determined that 14 were caused by driver error. To determine if the AAA proportion is accurate, a hypothesis test can be conducted using a significance level, α, of 0.05.