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 â€

Algebra ->  Probability-and-statistics -> 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 †     Log On


   

Question 1168607: 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 ​95% confidence interval estimate of the population standard deviation.
62,63,63,56,63,52,61,60,61,69,60,66
Need to find
The confidence interval is mi/h < o < mi/h
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
mean is 61.33
s=4.36
95% CI has margin of error of t(0.975, df=11)*s/sqrt(12)
this is 2.201*4.36/sqrt(12)=2.770
the CI is (58.63, 64.03)