Question

A trade magazine routinely checks the​ drive-through service times of​ fast-food restaurants. Upper AA 9595​% confidence interval that results from examining 773773 customers in one​ fast-food chain's​ drive-through has a lower bound of 169.0169.0 seconds and an upper bound of 172.2172.2 seconds. What does this​ mean?

Answer 1

One can be 95% confident that the drive-through service times of​ fast-food chain is between 169 seconds and 172 seconds.

Explanation:

The confidence interval gives a range of value for the population mean or parameter, which is calculated from the statistic value of the data (that is sample statistic). This range gives the interval which is associated with a certain level of confidence for which the interval will contain the true value of the unknown parameter (true value). In the scenario above, the associated confidence level is 95%.Hence, we can be 95% confident that the true value will be continued with the interval (169 ; 172)