The table below presents shear strengths (in kN/mm) and weld diameters (in mm) for a sample of spot welds. Diameter Strength 51 54 69 81 75 4.2 4.4 4.6 4.8 5.0 5.2 5.4 5.6 79 89 101
The table below presents shear strengths (in kN/mm) and weld diameters (in mm) for a sample of spot welds. Diameter Strength 51 54 69 81 75 4.2 4.4 4.6 4.8 5.0 5.2 5.4 5.6 79 89 101
A First Course in Probability (10th Edition)
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ISBN:9780134753119
Author:Sheldon Ross
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Chapter1: Combinatorial Analysis
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Transcribed Image Text:The table below presents shear strengths (in kN/mm) and weld diameters (in mm) for a sample of
spot welds.
Diameter Strength
4.2
51
4.4
54
4.6
4.8
69
81
5.0
75
5.2
79
5.4
89
5.6
101
5.8
6.0
98
102
1) Fit a regression line of strength on diameter and interpret the results.
2) Asses the fit of the regression line.
3) Determine the residuals and the standardized residuals.
4) Draw the histogram of the residuals. Does it appear that the errors are nomally distributed?
Explain.
5) Identify possible outliers.
6) Plot the residuals versus the predicted values. Does it appear that heteroscedacity is a
problem? Explain.
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