Plot contours of the fitted surface in the region

Reference no: EM131832209

(a) Fit a first-order model to the following data on the strength of welds:

2198_data on the strength of welds.png

(b) Plot contours of the fitted surface in the region of experimentation.

(c) Stating assumptions, say how ultimate tensile stress might be increased. The standard deviation of an individual y reading is approximately one unit.

Reference no: EM131832209

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