A large University system, which currently uses a standard grading system of A, B, C, D...

A large University system, which currently uses a standard grading system of A, B, C, D or F for their students, is analyzing the possibility of changing to a plus-minus grading policy. In addition to the computer system, which stores and manages all the student records, the faculty and the students would also be affected by this possible change. One of the concerns that students have, is that changing this policy might lower the overall GPA (grade point average) of the students. One statement from students makes the conjecture that only 20% of all the students in the system are supportive of the proposed change.

A)You draw a random sample of 260 students from this university system. Assuming that the student conjecture is true, would you expect to see 80 students supportive of the change? Explain.

B)Suppose in your random sample of 260 students from this university system, 80 students are supportive of the change. Based on the data do you think that the student’s conjecture that 20% of all the students in the system are supportive of the proposed change could be correct?

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