9. A manufacturer of steel cable formerly claimed a mean breaking strength of 55, 000 kilos with a standard deviation of 500 kilos. Because of an improved manufacturing process, the manufacturer now claims an increase breaking-strength value. A sample of 50 cables is tested and the mean breaking strength is found to be 55, 250 kilos. Does this support the manufacturer's claim at 0.01 level of significance? Ho:- На: - a = Zeri= Zcom =, comparison Computation: DR: Conclusion:

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