SOLUTION: Listed below are speeds (mi/h) measured from traffic on a busy highway. This simple random sample was obtained at 3:30 P.M. on a weekday. Use the sample data to construct a 9
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-> SOLUTION: Listed below are speeds (mi/h) measured from traffic on a busy highway. This simple random sample was obtained at 3:30 P.M. on a weekday. Use the sample data to construct a 9
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Question 1169423: Listed below are speeds (mi/h) measured from traffic on a busy highway. This simple random sample was obtained at 3:30 P.M. on a weekday. Use the sample data to construct a 95% confidence interval estimate of the population standard deviation.
62
60
60
57
60
52
59
58
59
68
58
67
The confidence interval estimate is nothing mi/h<σ< mi/h. Answer by Boreal(15235) (Show Source):
You can put this solution on YOUR website! mean is 60 mi/hr
sd is 4.26 mi/hr
t(0.975, df=11)=2.201
95% half-interval is 2.201*4.26/sqrt(12)=2.71
interval then is (57.29, 62.71) units mi/hr.
