Question

A trade magazine routinely checks the​ drive-through service times of​ fast-food restaurants. An 80​% confidence interval that results from examining 586 customers in one​ fast-food chain's​ drive-through has a lower bound of 165.7 seconds and an upper bound of 168.9 seconds. What does this​ mean?

one can be ___% confident that the mean drive through service time of this fast food chain is between ___ seconds and ___ seconds.

Answer 1

Given data :

An 80​% confidence interval that results from examining 586 customers in one​ fast-food chain's​ drive-through has a lower bound of 165.7 seconds and an upper bound of 168.9 seconds.

means 80% sure that the true mean waiting time for all customers in one food chain's​ drive-through between 165.7 and  168.9 seconds

Ans :

one can be 80% confident that the mean drive through service time of this fast food chain is between 165.7 seconds and 168.9 seconds.