Montana currently ranks near the top (if not the highest, dependent on the study
ID: 3047953 • Letter: M
Question
Montana currently ranks near the top (if not the highest, dependent on the study) in the nation in alcohol-related car accident fatality rates. State congress is considering several ways to improve our state’s statistics from funding education programs to increasing punishment for driving while intoxicated offenses to lowering the blood alcohol content level required to be considered a DUI. One congressional aide uses the National Highway Traffic Safety Administration’s Fatality Analysis Reporting System to obtain a random sample of 40 fatal alcohol related car accidents (defined as fatal accidents in which the driver of the car had a blood alcohol content (BAC) of at least 0.01 g/dL) from Montana in 2016. The aide is interested in whether the mean BAC level of drivers involved in fatal car accidents in Montana is higher than the 0.08 limit required to be designated as driving while intoxicated.
1.Identify the parameter of interest for these data. Select one.
a.The true proportion of Montana drivers involved in a fatal accident with a BAC level of at least 0.01 g/dL.
b.The long-run proportion of Montana drivers involved in a fatal accident with a BAC level of at least 0.08 g/dL (above the legal limit).
c.The population average BAC of U.S. drivers involved in a fatal alcohol-related car accident.
d.The mean BAC of all Montana drivers involved in a fatal alcohol-related car accident.
Explanation / Answer
Parameter of interest is the mean of BAC content in blood of drivers in only Montana (not the entire US).
Answer: Option d. The mean BAC of all Montana drivers involved in a fatal alcohol-related car accident.