a travel magazine routinely checks the drive through service times of fast food

Question

a travel magazine routinely checks the drive through service times of fast food sestaurants. a 90% confidence interval that results from examining 653 customers in one fast food chain's drive through has a lower bound of 178.2 seconds and an upper bound of 181.6 seconds. What does this mean?

a.) one can be 90% confident that the mean dirve through service time of this fast food chain is 179.9 seconds.
b.) the mean drive through service time of this fast food chain is 179.9 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 178.2 seconds and 181.6 seconds.
d.) one can be 90% confident that the mean drive through service time of this fast food chain is between 178.2 seconds and 181.6 seconds.

Explanation / Answer

Answer: (d)

d.) one can be 90% confident that the mean drive through service time of this fast food chain is between 178.2 seconds and 181.6 seconds.

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