Incidence of congestion on the city streets

Assignment Help Basic Statistics

Reference no: EM13824206

Problem 1:

Several complaints recently have been sent to the Gotham City police department regarding the increasing incidence of congestion on the city's streets. The complaints attribute the cause of these traffic tie-ups to a lack of synchronization of the traffic lights. The lights are controlled by a main computer system, and adjusting this program is costly. Therefore, the controllers are reluctant to change the situation unless a clear need is shown.

During the past year, the police department has collected data at 1,000 intersections. The data were compiled on a monthly basis as shown below:

Month Congestion Incidence

January 14

February 18

March 14

April 12

May 16

June 8

July 19

August 12

September 14

October 7

November 10

December 18

a. Construct a p-chart based on the above data.

b. Should the system be modified if, during the next three months, reports of congestion at these 1,000 intersections indicate the following:

Month Congestion Incidence

January 15

February 9

March 11

Reference no: EM13824206

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