question archive Given the following results of a direct shear test, plot the test data and least squares best fit line

Given the following results of a direct shear test, plot the test data and least squares best fit line

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Given the following results of a direct shear test, plot the test data and least squares best fit line. What is the soil cohesion (y intercept) and what is the tangent of the friction angle (slope)?

Specimen                Normal Stress (psf)         Shear Stress (psf)

1                                   200                               450

2                                   400                              520

3                                   600                               590

4                                 1000                               740

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