1. I have fit the equation y = 2.5 + 3x to a set of data. The residual for the point (5, 10) is
A. 7.5.
B. -7.5.
C. -27.5.
2. I have fit a line to data representing cholesterol readings for 28 individuals starting a cholesterol reducing drug. The computer provides the following output
The degrees of freedom for the t test for the slope are
A. 28.
B. 27.
C. 26.
3. I have fit a line to data representing cholesterol readings for 28 individuals starting a cholesterol reducing drug. The computer provides the following output
The 95% confidence interval for the slope is
A. 0.6627 ± 0.2935.
B. 0.6627 ± 0.2799.
C. 0.6627 ± 0.1428.