#16) a trade magazine routinely checks the drive through service times of fast f

Question

#16) a trade magazine routinely checks the drive through service times of fast food restaurants. a 90% confidence interval that results from examining 653 customers in one fast food chains drive through has a lower bound of 178.2 secinds and an upper bound of 181.6 seconds. what does this mean?

a.) one can be 90% confident that the mean deive through serivce 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

90% Confidence interval suggest that we are 90% confident that true mean is lie within the interval.

Hence, option D is correct.

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