Essay
A study was conducted to compare the mean numbers of police emergency calls per eight-hour shift in two districts of Toronto. Samples of 100 eight-hour 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. Interpret the interval.
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The 90% confidence interval for 
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Correct Answer:
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