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 800 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 January February March April May June July August September October November December CRIME INCIDENCE 13 7 12 p bar Sp UCL LCL 8 13 7 8 12 10 14 10 8 SAMPLE SIZE 800 800 800 800 800 800 800 800 800 800 800 800 CRIME RATE 0.01625 0.00875 0.01500 0.01000 0.01625 0.00875 0.01000 0.01500 0.01250 0.01750 0.01250 0.01000 a. Determine the P, Sp, UCL and LCL for a p-chart of 95 percent confidence (at Z= 1.96). Note: Round your answers to 5 decimal places. b. If the next three months show crime incidences in this area as
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 800 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 January February March April May June July August September October November December CRIME INCIDENCE 13 7 12 p bar Sp UCL LCL 8 13 7 8 12 10 14 10 8 SAMPLE SIZE 800 800 800 800 800 800 800 800 800 800 800 800 CRIME RATE 0.01625 0.00875 0.01500 0.01000 0.01625 0.00875 0.01000 0.01500 0.01250 0.01750 0.01250 0.01000 a. Determine the P, Sp, UCL and LCL for a p-chart of 95 percent confidence (at Z= 1.96). Note: Round your answers to 5 decimal places. b. If the next three months show crime incidences in this area as
Practical Management Science
6th Edition
ISBN:9781337406659
Author:WINSTON, Wayne L.
Publisher:WINSTON, Wayne L.
Chapter2: Introduction To Spreadsheet Modeling
Section: Chapter Questions
Problem 20P: Julie James is opening a lemonade stand. She believes the fixed cost per week of running the stand...
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