मराठी
महाराष्ट्र राज्य शिक्षण मंडळएचएससी वाणिज्य (इंग्रजी माध्यम) इयत्ता १२ वी

Ranking of 8 trainees at the beginning (X) and at the end (Y), of a certain course are given below : - Mathematics and Statistics

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प्रश्न

Ranking of 8 trainees at the beginning (X) and at the end (Y), of a certain course are given below : 

Trainees A B C D E F G H
X 1 2 4 5 6 8 3 7
Y 2 4 3 7 8 1 5 6

Calculate Spearman's rank correlation coefficient. 

बेरीज
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उत्तर

1 2 3 4 5
Trainee code Rank xi Rank yi di = xi - yi `d_"t"^2`
A 1 2 -1 1
B 2 4 -2 4
C 4 3 1 1
D 5 7 -2 4
E 6 8 -2 4
F 8 1 7 49
G 3 5 -2 4
H 7 6 1 1
        `sum "d"_"i"^2 = 68`

Given n = 8 , `sum "d"_"i"^2 = 68`

Rank correlation (R) = 1 - `(6 xx sum "d"_"i"^2)/("n"("n"^2 - 1))`

= `1 - (6 xx 68)/(8 xx 63)`

= 1 - 0.8095

= 0.1905

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2014-2015 (October)

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