An assembly process includes a torque wrench device that automatically tightens compressor housing bolts the device has a known process standard deviation of 3 lb ft in the torque applied A simple random sample of 35 nuts is selected, and the average torque to which they have been tightened is 150 ...

For a confidence level of 95 z 196 in the standard normal distributio ...

An assembly process includes a torque wrench device that automatically tightens compressor housing bolts; the device has

Question:

An assembly process includes a torque wrench device that automatically tightens compressor housing bolts; the device has a known process standard deviation of σ = 3 lb-ft in the torque applied. A simple random sample of 35 nuts is selected, and the average torque to which they have been tightened is 150 lb-ft. What is the 95% confidence interval for the average torque being applied during the assembly process?