:13.  Scatter diagram ? on page ? of the test shows scores on
the midterm and the final of a certain course.  Obviously, there
is a strong positive association between midterm scores and final
scores.  In fact, the correlation coefficient is <p>

a.  negative, and closer to -1 than to 0
 b.  negative, and closer to -1 than to 0
 c.  positive, and closer to 0 than to 1
 d.  positive, and closer to 1 than to 0
 e.  exactly 0