It is of interest to know if the average time it takes police to reach the scene of an accident differs from that of an ambulance to reach the same accident. 1) Use the summary data listed below to estimate the difference in the times (measured in minutes) between the police and the ambulance using a 99% confidence interval, and interpret the interval. Show your working.   Police Ambulance Sample size 60 55 Sample mean 4.2 4.1 Sample variance 0.08 0.10 2) Is it possible to conclude that arrival times for police and ambulance are different? Show your working.

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