5 Written Questions

5 Multiple Choice Questions

1. 
   1. correlation
   2. total variation
   3. explained variation
   4. deviation
2. 
   1. unexplained variation
   2. correlation
   3. explained variation
   4. correlation coefficient
3. positive if positive slope; r > 0
   negative if negative slope; r < 0
   1. total variation
   2. deviation
   3. correlation
   4. correlation coefficient
4. is always on the least-squares line
   1. explained variation
   2. the point (xbar, ybar)
   3. unexplained variation
   4. total variation
5. 
   1. deviation
   2. unexplained variation
   3. total variation
   4. explained variation

4 True/False Questions

1. equivalent least-squares equation →

   True        False

2. perfect linear correlation → positive if positive slope; r > 0
   negative if negative slope; r < 0

   True        False

3. r does not change →

   True        False

4. coefficient of determination →
   Explained variation over total variation

   True        False