The Lincoln Tunnel (under the Hudson River) connects suburban New Jersey to midtown Manhattan.

On Mondays at 8:30 A.M., the mean number of cars waiting in line to pay the Lincoln Tunnel toll is 1,220.

Because of the substantial wait during rush hour, the Port Authority of New York and New Jersey is considering raising the amount of the toll between 7:30 and 8:30 A.M. to encourage more drivers to use the tunnel at an earlier or later time (Newark Star-Ledger, Aug.

27,1995). Suppose the Port Authority experiments with peak-hour pricing for six months, increasing the toll from $4 to $7 during the rush hour peak. On 10 different workdays at 8:30 A.M. aerial photographs of the tunnel queues are taken and the number of vehicles counted. The results follow:

Analyze the data for the purpose of determining whether peak-hour pricing succeeded in reduclng the average number of vehicles attempting to use the Lincoln Tunnel during the peak rush hour. Utilize the information in the accompanying EXCEL printout.

EXCEL Output for Exercise 6.82 Count I Standard Error 1 50.81006025 1 Mean 989.8 Standard Deviation 160.6755184 Ranae Median I Minimum I 735 1 970.5 Mode Maximum