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The cooling system in a nuclear submarine consists of an assembly of welded pipes through which a…

The cooling system in a nuclear submarine consists of an assembly of welded pipes through which a coolant is circulated. Specifications require that weld strength must meet or exceed 150 psi.

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(a) Suppose that the design engineers decide to test the hypothesis  Explain why this choice of alternative hypothesis is better than H1: µ

(b) A random sample of 20 welds results in  = 157.65 psi and s = 12.39 psi. What conclusions can you draw about the hypothesis in part (a)? State any necessary assumptions about the underlying distribution of the data. Use the P-value approach.

 

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