Author Question: A teacher finds that final grades in the statistics department are distributed as: A, 25%; B, 25%; ... (Read 73 times)

kaid0807 · **on:** Feb 14, 2020

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

mohan · **Reply #1 on:** Feb 14, 2020

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