Question

A trade magazine routinely checks the​ drive-through service times of​ fast-food restaurants. Upper A 95​% confidence interval that results from examining 771 customers in one​ fast-food chain's​ drive-through has a lower bound of 175.2 seconds and an upper bound of 178.2 seconds. What does this​ mean?

Answer 1

Explanation:

The confidence interval is an interval that determines an unknown population parameter. It showcases the probability that a particular population parameter will fall within this interval. As the sample size reduces, the width of the confidence interval usually increases.

What the given question mean is that one can still be 95% confident that the mean drive-through service times of this​ fast-food chain is between 175.2 seconds and 178.2 seconds.