Stadium Dr. is a major artery through the UNC-Chapel Hill campus that connects South Rd. and Ridge Rd. Campus police are concerned that vehicles traveling on Stadium Dr. often exceed the posted speed limit of 20 miles per hour. To gather data on the speed of vehicles, campus police one day placed a radar speed detector by the side of Stadium Dr. and recorded the speed of cars over a 15-minute period. The speeds are shown below:

24 29 29 23 25 24 33 26 24 29 27 26

22 32 24 21 19 29 31 26 29 31 16

Question 1. Use the data above to construct a 95% confidence interval for the mean speedof vehicles traveling on Stadium Dr. (calculateyand s to 3 decimal places).

lower bound of confidence interval

upper bound of confidence interval

Question 2. Mark the following statement as true or false:The probability is .95 that the mean speedof vehicles on Stadium Dr. is contained in the interval calculated above.

True

False