Discussion:
Q: A professor in the psychology department would like to determine whether there has been a significant change in grading practices over the years. It is known that the overall grade distribution for the department in 1985 had 14% A's, 26% B's, 31% C's, 19% D's and 10% F's. A sample of n=200 psychology students from last semester produced the following grade distribution:
A B C D F
32 61 64 31 12
Do the data indicate a significant change in the grade distribution? Test at the .05 level of significance.