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 662 customers in one fast-food chain's drive-through has a lower bound of 174.4 seconds and an upper bound of 178.2 seconds. Which of the following is the proper interpretation of these results? One can be 90% confident that the mean drive-through service-time of this fast-food chain is 176.3 seconds. 90% of the time, the mean drive-through service time of this fast-food chain is 176.3 seconds. One can be 90% confident that the mean drive-through service time of this fast-food chain is between 174.4 seconds and 178.2 seconds. There is a 90% probability that the mean drive-through service time of this fast-food chain is between 174.4 seconds and 178.2 seconds.

Explanation / Answer

Answer is D

The mean will lie between the given range of values and this will be the population mean derived from the sample mean. So there is a 90% probability of this happening as given in the question

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