A common concern for students (and teachers) is the assignment of grades for essays or term papers. Because there are no absolute right or wrong answers, these grades must be based on a judgment of quality. To demonstrate that these judgments actually are reliable, an English instructor asked a colleague to rank-order a set of term papers. The ranks and the instructor’s grades for these papers are as follows: Rank Grade 1 A 2 B 3 A 4 B 5 B 6 C 7 D 8 C 9 C 10 D 11 F Compute the Spearman correlation for these data. (Note: You must convert the letter grades to ranks, using tied ranks to represent tied grades.) Is the Spearman correlation statistically significant? Use a two-tailed test with α = .05.
A common concern for students (and teachers) is the assignment of grades for essays or term papers. Because there are no absolute right or wrong answers, these grades must be based on a judgment of quality. To demonstrate that these judgments actually are reliable, an English instructor asked a colleague to rank-order a set of term papers. The ranks and the instructor’s grades for these papers are as follows: Rank Grade 1 A 2 B 3 A 4 B 5 B 6 C 7 D 8 C 9 C 10 D 11 F Compute the Spearman correlation for these data. (Note: You must convert the letter grades to ranks, using tied ranks to represent tied grades.) Is the Spearman correlation statistically significant? Use a two-tailed test with α = .05.
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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A common concern for students (and teachers) is the assignment of grades for essays or term papers. Because there are no absolute right or wrong answers, these grades must be based on a judgment of quality. To demonstrate that these judgments actually are reliable, an English instructor asked a colleague to rank-order a set of term papers. The ranks and the instructor’s grades for these papers are as follows:
|
Rank |
Grade |
|
1 |
A |
|
2 |
B |
|
3 |
A |
|
4 |
B |
|
5 |
B |
|
6 |
C |
|
7 |
D |
|
8 |
C |
|
9 |
C |
|
10 |
D |
|
11 |
F |
- Compute the Spearman
correlation for these data. (Note: You must convert the letter grades to ranks, using tied ranks to represent tied grades.) - Is the Spearman correlation statistically significant? Use a two-tailed test with α = .05.
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