WEEK 6 HOMEWORK
1.
Which of the following is not an assumption of the
regression model?
The error terms have constant
variance
The model is linear
The error terms are normally
distributed
The error terms are
independent
The error terms decrease as x values increase
2.
Suppose for a given data set the regression equation is: y
=
54.78
+
1.45x, and the point (0.00, 24.78) is in the data
set. The residual for this point is .
24.78
−24.78
0.00
30.00
−30.00
3.
If the standard error of the estimate for a regression model
fitted to a large number of paired observations is 1.75,
approximately 68% of the residuals would lie within .
−3.50 and +3.50
−0.95 and +0.95
−0.97 and +0.97
−0.68 and +0.68
−1.75 and +1.75
4.
For a regression model y
=
30
−
2x, the coefficient of
determination
was determined as equal to 0.81. The coefficient
of correlation is
.
−0.9
