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3. the posted speed limit on a particular segment of an...

# Question: the posted speed limit on a particular segment of an...

###### Question details

The posted speed limit on a particular segment of an interstate highway is 65 mph. To estimate the average speed of vehicles, the speeds of 20vehicles are recorded and the average speed is estimated to be 67 mph and the standard deviation is estimated to be 10 mph. Determine the 95% confidence interval for the mean vehicle speed