Question

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 9 cars, the average wait time is 8.271 minutes with a standard deviation of 1.5558 minutes. Construct a 95% confidence interval for the true average wait time for a car at the intersection between 4:00 PM and 5:00 PM. Question 3 options: 1) ( -7.075 , 9.467 ) 2) ( 7.098 , 9.444 ) 3) ( 7.075 , 9.467 ) 4) ( 7.752 , 8.79 ) 5) ( 5.965 , 10.577 )

Answer 1