In Team-Teaching, Two or More Teachers Lead a Class $r = - 0.32$

Essay

In team-teaching, two or more teachers lead a class. A researcher tested the use of team-teaching in mathematics education. Two of the variables measured on each teacher in a sample of 171 mathematics teachers were years of teaching experience x and reported success rate y (measured as a percentage) of team-teaching mathematics classes.
The correlation coefficient for the sample data was reported as $r = - 0.32$ . Interpret this result.