At the completion of most courses in universities and colleges, a course evaluation is undertaken. Some professors believe that the way in which students fill out the evaluations is based on how well the student is doing in the course. To test this theory, a random sample of course evaluations was selected.

Two answers were recorded. The questions and answers are:

a. How would you rate the course?

1. Poor 

2. Fair 

3. Good 

4. Very good 

5. Excellent

b. What grade do you expect in this course?

1. F 

2. D 

3. C 

4. B 

5. A

Is there enough evidence to conclude that the theory is correct?