One-Way ANOVA
Professor Brunner had students in his Marketing class rate his performance as Excellent, Good, Fair or Poor. A graduate student collected the ratings and assured the students that Professor Brunner would not receive them until after the course grades had been submitted. The rating (i.e. the treatment) a student gave the professor was matched with his/her course grade, which could range from 0 to 100. The data is as follows:
Course Grades
|
Excellent |
Good |
Fair |
Poor |
|
94 |
75 |
70 |
68 |
|
90 |
68 |
73 |
70 |
|
85 |
77 |
76 |
72 |
|
80 |
83 |
78 |
65 |
|
88 |
80 |
74 | |
|
68 |
65 | ||
|
65 |
Is there a difference in the mean scores of the students in each of the four rating categories at a 99% confidence level?
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