# Question

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

(a) Suppose the designers decide to test the hypothesis H0: = 150 versus H1: > 150. Explain why this choice of alternative is preferable to H1: < 150

(b) A random sample of 20 welds results in = 153.7 psi and s = 11.5 psi. What conclusions can you draw about the hypothesis in part (a)? Use = 0.05.

(a) Suppose the designers decide to test the hypothesis H0: = 150 versus H1: > 150. Explain why this choice of alternative is preferable to H1: < 150

(b) A random sample of 20 welds results in = 153.7 psi and s = 11.5 psi. What conclusions can you draw about the hypothesis in part (a)? Use = 0.05.

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