Match the following sample correlation coefficients with the explanation of what that correlation coefficient means. Type the correct letter in each box.

 1. $r = -1$
 2. $r = 0$
 3. $r = .1$
 4. $r= -.15$

A. a perfect negative relationship between $x$ and $y$
B. a weak positive relationship between $x$ and $y$
C. no relationship between $x$ and$y$
D. a weak negative relationship between $x$ and $y$