The article “The Undrained Strength of Some Thawed Permafrost Soils” (Canadian Geotechnical Journal [1979]: 420–427) contained the accompanying data (see page 830) on y = shear strength of sandy soil (kPa), x₁ = depth (m), and x₂ = water content (%). The predicted values and residuals were computed using the estimated regression equation 

a. Use the given information to compute SSResid, SSTo, and SSRegr.

b. Calculate R² for this regression model. How would you interpret this value?

c. Use the value of R² from Part (b) and a .05 level of significance to conduct the appropriate model utility test.

Transcribed Image Text:

夕=-15 1.36-16.22x, + 1 3.48x2 + .094x3-253x4 +492x x2, and x