The derailment of a freight tr

The derailment of a freight train due to the catastrophic failure of a traction motor armature bearing provided the impetus for a study reported in the article “Locomotive Traction Motor Armature Bearing Life Study” (Lubrication Engr., Aug. 1997: 12–19). A sample of 17  high-mileage traction motors was selected and the amount of cone penetration (mm@10) was determined both for the pinion bearing and for the commutator armature bearing, resulting in the following data:

Calculate an estimate of the population mean difference between penetration for the commutator armature bearing and penetration for the pinion bearing, and do so in a way that conveys information about the reliability and precision of the estimate.

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