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The amount of lateral expansion (mils) was determined for a sample of n = 9 pulsed- power gas metal are welds used in LNG ship

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The amount of lateral expansion (mils) was determined for a sample of n = 9 pulsed- power gas metal are welds used in LNG ship containment tanks. The resulting sample standard deviation was s = 2.81 mils. Assume normality. (a) Determine a 95% confidence interval for of (b) Determine a 95% confidence interval for a

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