Suppose you are a civil engineer, specializing in traffic volume control for the City of Grand Rapids.

Suppose you are a civil engineer, specializing in traffic volume control for the City of Grand Rapids. Your department has been receiving a multitude of complaints about traffic wait times for a certain intersection in the heart of downtown. To see if these claims are valid, you want to monitor the true average wait time at that intersection. Over the course of a few months, you record the average number of minutes a car waits at the intersection between 4:00 PM and 5:00 PM. With a sample size of 8 cars, the average wait time is 6.278 minutes with a standard deviation of 2.3362 minutes. Construct a 90% confidence interval for the true average wait time for a car at the intersection between 4:00 PM and 5:00 PM.

Question 6 options:

1) 

( 4.383 , 8.173 )

2) 

( 5.452 , 7.104 )

3) 

( -4.713 , 7.843 )

4) 

( 4.742 , 7.814 )

5) 

( 4.713 , 7.843 )