Choose the correct formula to find the confidence interval in the following scenario. Then find the confidence interval and write the conclusion.

A city councilman wants to know the mean response times for a fire station. Response time is measured by the difference between the time an emergency call comes into the fire station and the time the first fire truck arrives at the scene of the fire. Data were collected. A random sample of 40 calls selected from the fire station had a mean response time of 12.3 minutes with a standard deviation of 3.8 minutes. Construct and interpret a 99 percent confidence interval for the mean response time for the fire station.

Correct formula:

Interval:

Concluding sentence: