A new manufacturing method is supposed to increase the average life span of electronic com- ponents, while the variance

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A New Manufacturing Method Is Supposed To Increase The Average Life Span Of Electronic Com Ponents While The Variance 1 (86.82 KiB) Viewed 107 times

A new manufacturing method is supposed to increase the average life span of electronic com- ponents, while the variance of the life span is expected to stay the same. Using the previous manufacturing method, the average life span was 112.5 hours with a variance 12 hours. The man- ufacturer wishes to establish the new average life span by measuring the life spans of a sample of components manufactured using the new method. life (a) What sample size should be used, if the manufacturer wishes to establish the new average span to within 1 hours, with 90% level of confidence? (8) (b) How will the required sample size change, if the manufacturer wishes to establish the new average life span to within 1 hours, with 95% level of confidence? (6) (c) How will the required sample size change, if the manufacturer wishes to establish the new average life span to within 1/2 hours, with 90% level of confidence? (6) [20]