An ambulance service claims that it takes on the average 8.9 minutes to reach
its destination in emergency calls. To check this claim, the agency which
licenses ambulance services has them time on 50 emergency calls, getting a
mean of 9.3 minutes with a standard deviation of 1.6 minutes. What can you
conclude at the level of significance of 0.05? Also determine the 99%
confidence limits for the mean time to reach the destination on an emergency
call.
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