Answer to Question #44416 in Statistics and Probability for Sean

Question

For students taking online courses at ABC University, grades have been distributed as follows: A – 40%, B – 30%, C – 15%, D – 10% and F – 5%. A sample of 173 students taking online courses at KSU has been collected. In this problem, you will conduct a chi-square test to determine if the distribution of grades for online classes at KSU is the same as for ABC University.

a. Set up the null and alternative hypotheses to test whether or not the grade distribution for KSU is significantly different from the grade distribution for ABC University. (2 points)

b. Compute the expected frequency for the sample of 173 students. (2 points)

Grade Expected Frequency, ei
A 69
B 52
C 26
D 17
F 9
Total 173


c. What is the critical 2 value for a level of significance of .01? (1 points)



d. Show the Excel function you could use to determine the critical 2 value. (1 point)



e. In the attached Chi-Square Distribution Table, circle the critical 2 value (1 point)

The actual distribution of grades for the KSU studen