A trade magazine routinely checks the drive-through service times of fast-food r

Question

A trade magazine routinely checks the drive-through service times of fast-food restaurants. A 90% confidence interval that results from examining 668 customers in one fast-food chain's drive-through has a lower bound of 170.4 seconds and an upper bound of 174.0 seconds. What does this mean? Choose the correct answer below. A. One can be 90% confident that the mean drive-through service time of this fast-food chain is between 170.4 seconds and 174.0 seconds. B. The mean drive-through service time of this fast-food chain is 172.2 seconds 90% of the time. C. There is a 90% probability that the mean drive-through service time of this fast-food chain is between 170.4 seconds and 174.0 seconds. D. One can be 90% confident that the mean drive-through service time of this fast-food chain is 172.2 seconds.

Explanation / Answer

90%confidence interval means we are 90% confident that true result falling in this interval

So answer is A) One can be 90% confident that the mean drive through service time of this fast food chain is between 170.4 seconds and 174.0 seconds.

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