Mathematics

Martha Riggs

7 November, 07:41

A teacher finds that final grades in the statistics department are distributed as: A, 25%; B, 25%; C, 40%; D, 5%; F, 5%. At the end of a randomly selected semester, the following grades were recorded. Calculate the chi-square test statistic chi squared used to determine if the grade distribution for the department is different than expected. Use alpha equals 0.01.

Grade A B C D F

Number 42 36 60 8 14

(A) 3.41

(B) 5.25

(C) 6.87

(D) 4.82