Hypothesis Testing:

(ii) P-value = 2P(Z>4.8462)=2(0)=0. Since the P-value ( (=0.05, reject H0. Conclusion: true average tread lives for two competing brand tires are different. If you prefer to answer the question computing the confidence interval, 95% confidence interval would become =(1250.67, 2949.33). ................
................