Statistics Solutions

[Solution] A manufacturer produces drill bits with an intended life of at least 580 hours and a standard deviation of 30 hours. A quality control scientist draws

Question: A manufacturer produces drill bits with an intended life of at least 580 hours and a standard deviation of 30 hours. A quality control scientist draws a sample of 100 bits and finds \[\bar{X}\] =577. Test at α=.05 to see if the machinery needs adjusting.

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