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A researcher wishes to estimate the average blood alcohol concentration​ (BAC) for drivers involved in fatal...

A researcher wishes to estimate the average blood alcohol concentration​ (BAC) for drivers involved in fatal accidents who are found to have positive BAC values. He randomly selects records from 75 such drivers in 2009 and determines the sample mean BAC to be 0.17 ​g/dL with a standard deviation of 0.060 ​g/dL.

All areas of the country use a BAC of 0.11 ​g/dL as the legal intoxication level. Is it possible that the mean BAC of all drivers involved in fatal accidents who are found to have positive BAC values is less than the legal intoxication​ level? Explain.

A. ​Yes, it is possible that the mean BAC is less than 0.11 ​g/dL, because it is possible that the true mean is not captured in the confidence​ interval, but it is not likely.

B. ​No, it is not possible that the mean BAC is less than 0.11 ​g/dL, because it is possible that the true mean is not captured in the confidence​ interval, but it is not likely.

C. ​No, it is not possible that the mean BAC is less than 0.11 ​g/dL, because it is possible that the true mean is not captured in the confidence interval.

D. ​Yes, it is possible that the mean BAC is less than 0.11 ​g/dL, because it is possible that the true mean is not captured in the confidence interval and it is highly probable.

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