An experiment was designed for the Department of Materials

Chapter , Problem 7.82

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An experiment was designed for the Department of Materials Engineering at Virginia Tech to study hydrogen embrittlement properties based on electrolytic hydrogen pressure measurements. The solution used was 0.1 N NaOH, and the material was a certain type of stainless steel. The cathodic charging current density was controlled and varied at four levels. The effective hydrogen pressure was observed as the response. The data follow. Charging Current Effective Density, x Hydrogen Run ( mA/cm2) Pressure, y (atm) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 0.5 0.5 0.5 0.5 1.5 1.5 1.5 2.5 2.5 2.5 2.5 3.5 3.5 3.5 3.5 86.1 92.1 64.7 74.7 223.6 202.1 132.9 413.5 231.5 466.7 365.3 493.7 382.3 447.2 563.8 (a) Run a simple linear regression of y against x. (b) Compute the pure error sum of squares and make a test for lack of fit. (c) Does the information in part (b) indicate a need for a model in x beyond a first-order regression? Explain.

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