Explore BrainMass

Explore BrainMass

    Confidence Interval, Standard Deviation and Normal Distribution

    Not what you're looking for? Search our solutions OR ask your own Custom question.

    This content was COPIED from BrainMass.com - View the original, and get the already-completed solution here!

    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


    Solution Preview

    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 ...

    Solution Summary

    Confidence Interval, Standard Deviation and Normal Distribution are investigated.