Maurice Tutor

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About Maurice Tutor

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Teaching Since: May 2017
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Education

  • MCS,PHD
    Argosy University/ Phoniex University/
    Nov-2005 - Oct-2011

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  • Professor
    Phoniex University
    Oct-2001 - Nov-2016

Category > Management Posted 28 Jan 2018 My Price 7.00

Sulfide Cracking Resistance Improvement

During oil drilling operations, components of the drilling assembly may suffer from sulfide stress cracking. The article “Composition Optimization of High-Strength Steels for Sulfide Cracking Resistance Improvement” (Corrosion Sci., 2009: 2878–2884) reported on a study in which the composition of a standard grade of steel was analyzed. The following data on y = threshold stress (% SMYS) and x = yield strength (MPa) was read from a graph in the article (which also included the equation of the least squares line).

a. Does a scatterplot support the use of the simple linear regression model for relating y to x?

b. What proportion of observed variation in stress can be attributed to the approximate linear relationship between the two variables?

c. Determine a 90% confidence interval for the true average threshold stress of all similar steel specimens whose yield strength is 800 MPa. d. Determine a 90% prediction interval for the threshold stress of a single steel specimen whose yield strength is 800 MPa.

Answers

Maurice Tutor
(5)
Status NEW Posted 28 Jan 2018 09:01 PM My Price 7.00

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