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The state and local police departments are trying to analyze crime rates so they can shift their patrols from decreasing-rate areas to areas where rates

The state and local police departments are trying to analyze crime rates so they can shift their patrols from decreasing-rate areas to areas where rates are increasing. The city and county have been geographically segmented into areas containing 5,000 residences. The police recognize that not all crimes and offenses are reported: People do not want to become involved, consider the offenses too small to report, are too embarrassed to make a police report, or do not take the time, among other reasons. Every month, because of this, the police are contacting by phone a random sample of 1,000 of the 5,000 residences for data on crime. (Respondents are guaranteed anonymity.) Here are the data collected for the past 12 months for one area:

Month

Crime Incidence

Sample Size

Crime Rate

January

 7

 1,000

 0.007

February

 9

1,000

0.009

March

 7

1,000

0.007

April

 7

1,000

0.007

May

 7

1,000

0.007

June

 9

1,000

0.009

July

 7

1,000

0.007

August

10 

1,000

0.010

September

 8

1,000

0.008

October

11 

1,000

0.011

November

10 

1,000

0.010

December

 8

1,000

0.008

Construct a p-chart for 95 percent confidence (1.96) and plot each of the months. If the next three months show crime incidences in this area as

what comments can you make regarding the crime rate?

 

 

 

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