6 9-1-1 A study was conducted to compare themean numbers of police emergency calls per
Chapter 8, Problem 46(choose chapter or problem)
6 9-1-1 A study was conducted to compare themean numbers of police emergency calls per 8-hourshift in two districts of a large city. Samples of100 8-hour shifts were randomly selected from thepolice records for each of the two regions, and thenumber of emergency calls was recorded for eachshift. The sample statistics are listed here:Region1 2Sample Size 100 100Sample Mean 2.4 3.1Sample Variance 1.44 2.64Find a 90% confidence interval for the difference inthe mean numbers of police emergency calls per shiftbetween the two districts of the city. Interpret theinterval.
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