Question 1
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
χ2 used to determine if the grade distribution for the department is different than expected. Use
α = 0.01.

◦ 5.25
◦ 6.87
◦ 4.82
◦ 3.41
Question 2
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. Find the rejection region used to determine if the grade distribution for the department is different than expected. Use
α = 0.01.

◦
χ2 > 13.277
◦
χ2 > 7.779
◦
χ2 > 11.143
◦
χ2 > 9.488