The amount of lateral expansion (mils) was determined for a sample ofCI for ?2 , mils2CI for ? , mils I find these answer but incorrect, where is my mistake? The amount of lateral expansion (mils) was determined for a sample of n = 7 pulsed-power gas metal arc welds used in LNG ship containment tanks. The resulting sample standard deviation was s = 2.87 mils. Assuming normality, derive a 95% CI for ?2 and for ?. (Round your answers to two decimal places.) Solution wait??.