Question

A trade magazine routinely checks to drive-through service times of fast food restaurants and 95% confidence interval that results from examining 501 customers in one fast food chains drive-through has a lower bound of 166.2 seconds in an upper bound of 169.6 seconds what does this mean?

Answer 1

The confidence level of an interval is the probability that the mean of an distribution rest inside this interval.

Then, there is a 95% probability that the mean drive-through service time of this fast-food chain is between 166.2 seconds and 169.6 seconds.