The State Highway Patrol (SHP) periodically samples vehicle speeds at Milepost 92 on Interstate 17. The SHP is concerned about the dispersion of speeds of vehicles sharing the same highway because significant difference in speed is a known cause of accidents. The speeds of a random sample of 16 vehicles are shown below.
a. Develop a 90% confidence interval estimate of the population variance .
b. Develop a 90% confidence interval estimate of the population standard deviation.

Question

The State Highway Patrol (SHP) periodically samples vehicle speeds at Milepost 92 on Interstate 17. The SHP is concerned about the dispersion of speeds of vehicles sharing the same highway because significant difference in speed is a known cause of accidents. The speeds of a random sample of 16 vehicles are shown below.  
a. Develop a 90% confidence interval estimate of the population variance .
b. Develop a 90% confidence interval estimate of the population standard deviation.

Quizplus · Accepted Answer

The Answer of The State Highway Patrol (SHP) periodically samples vehicle speeds at Milepost 92 on Interstate 17. The SHP is concerned about the dispersion of speeds of vehicles sharing the same highway because significant difference in speed is a known cause of accidents. The speeds of a random sample of 16 vehicles are shown below.  
a. Develop a 90% confidence interval estimate of the population variance .
b. Develop a 90% confidence interval estimate of the population standard deviation.

The State Highway Patrol (SHP) Periodically Samples Vehicle Speeds at Milepost