Answered: Suppose that two raters (Rater A and…

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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Suppose that two raters (Rater A and Rater B) each assign physical attractiveness scores (0 = not at all attractive to 10 = extremely attractive) to a set of seven facial photographs. Pearson’s r can be used as an index of interrater reliability or agreement on quantitative ratings. A correlation of +1 would indicate perfect rank-order agreement between raters, while an r of 0 would indicate no agreement about judgments of relative attractiveness. An r of .8 to .9 is considered desirable when reliability is assessed. For this example, Rater A’s score is the X variable and Rater B’s score is the Y variable. The ratings are as follows:

Photo	Rater A	Rater B
1	3	5
2	5	5
3	8	9
4	7	8
5	6	4
6	10	9
7	5	4

Compute the Pearson correlation between the Rater A and Rater B attractiveness ratings. What is the obtained r value?
Is your obtained r statistically significant (using α =.05, two tailed)?
Are the Rater A and Rater B scores “reliable”? Is there good or poor agreement between raters?

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