Two companies manufacture a rubber material intended For use in an automotive application. The part will be subjected co abrasive wear in the field applications, so we decide to compare che 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 = 20.12 -, the sample mean and standard deviation of wear ng/1000 cycles and s1=1.9 mg/1000 cycles. And for company 2, obtain x2 f the two companies produce material with different mean Jse the istributed, but =teps: (1) are x, we Test = 11.64 mg/1000 cycles and s2=7.9 mg/1000 cycles. wear? is normally each population not equal. Use the P-value approach. Assume seven their variances are Interest of parameter, (2) Ho, (3) H1, (4) TS, (5) V/CR. (6) TV, (7) Decision. Let a be 0.05.

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