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 σ and for σ^2.© BrainMass Inc. brainmass.com March 4, 2021, 6:23 pm ad1c9bdddf
Please see the attached file for the complete solution.
Thanks for using BrainMass.
(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 ...
Confidence Interval, Standard Deviation and Normal Distribution are investigated.