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 (a) Suppose that the design engineers decide to test the hypothesis H0 150 versus H1 150 Explain x 86 why this choice of alternative hypothesis is better than H1 150 (b) A random sample of 20 welds results in psi and s x 11 3 psi What conclusions can you draw about the hypothesis in part (a) State any necessary assumptions about the underlying distribution of the data

Question: 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

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.
(a) Suppose that the design engineers decide to test the hypothesis H0: μ = 150 versus H1: μ = 150. Explain x = 86
why this choice of alternative hypothesis is better than H1: μ < 150.
(b) A random sample of 20 welds results in psi and s x = 11.3 psi. What conclusions can you draw about the hypothesis in part (a)? State any necessary assumptions about the underlying distribution of the data.

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