- Two Companies Manufacture A Rubber Material Intended For Use In An Automotive Application The Part Will Be Subjected To 1 (49.1 KiB) Viewed 78 times
Two companies manufacture a rubber material intended for use in an automotive application. The part will be subjected to abrasive wear in the field applications, so we decide to compare the material produced by each
company in a test. Twenty-five parts of the material from each
company are tested in an abrasion test, and the amount of wear after 1000 cycles is observed. For
company 1, the sample mean and standard deviation of wear are in 20.12 mg/1000 cycles and su=1.9 mg/1000 cycles. And for
company 2, we obtain x2 11.64 mg/1000 cycles and S2=7.9 mg/1000 cycles. Test if the two companies produce material with different mean wear? Use the P-value approach. Assume each population is normally distributed, but their variances are not equal. Use the seven steps: (1) Interest of parameter, (2) Ho, (3) Hi, (4) TS, (5) CV/CR, (6) TV, (7) Decision. Let a be 0.05.