A study was conducted to compare the mean numbers of police emergency calls per 8-hour shift in two districts of Los Angeles. Samples of 100 8-shifts were randomly selected from the police records for each of the two regions, and the number of emergency calls was recorded for each shift. The sample statistics are listed below: 
Find a 90% confidence interval for the difference in the mean numbers of police emergency calls per shift between the two districts of the city.
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Interpret the interval.
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Definitions:
Post-Anesthesia Care Unit (PACU)
A specialized hospital ward where patients are monitored and recover immediately after anesthesia and surgical procedures.
Surgical Complications
Unexpected problems or adverse events that can occur during or after surgery, which can affect the outcome or recovery of the patient.
Preoperative Phase
The period before a surgical operation begins, involving patient assessments and preparation for surgery.
Sterile Field
A specific area, free of all microorganisms, used during medical procedures to prevent infection.
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