I put 137 it is not correct, help please. we have data on 14? brown bears, and w
ID: 2909462 • Letter: I
Question
I put 137 it is not correct, help please.
we have data on 14? brown bears, and we construct a model to predict weight based on head length and width, neck girth, length of body, and chest girth. Partial regression output is shown in the table The regression equation is Weight =-274-4.23 Head. L-051 Head. W + 7.06 Neck. G + 0.807 Length + 8.98 Chest. Coef SE coef Predictor Constant Head. L Head. W Neck. G Length Chest. G 273.7118.83 2.810 2.891 1.460 0.8069 0.6312 14.53 0.000 51 0.134 -0.180.860 4.830.000 1.280.203 8.97580.8655 10.37 0.000 -4.231 -0.510 7.056 What are the degrees of freedom, df, for the model?Explanation / Answer
With all 5 predictors present, degrees of freedom (df) for the model = 143 - (5 +1) = 143 - 6 = 137
But since Head.L, Head.W and Length are not significant predictors (since P-value > 0.05),
so once we remove these 3 predictors, in the modified model
degrees of freedom (df) for the model = 143 - (2 + 1) = 140