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# Confidence Interval, Standard Deviation and Normal Distribution

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44. The amount of lateral expansion (mils) was determined for a sample of n = 9 pulsed-power gas metal arc welds used in LNG ship containment tanks. The resulting sample standard deviation was s = 2.81 mils. Assuming normality, derive a 95% CI for &#963; and for &#963;^2.

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(The problem is from confidence interval.)

Use the 2 (chi-squared) distribution for the confidence interval for the variance

The confidence interval (C.I.) includes the area under the curve in ...

#### Solution Summary

Confidence Interval, Standard Deviation and Normal Distribution are investigated.

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