Question

2000 candidates appeared for a competitive examination. 400 came
out successful. 350 had attended a coaching class and of these 200
had come out successful. Estimate the utility of coaching classes,
using Yule's coefficient of Association.
​

Answer 1

Out of 1800 candidates appeared for a competitive examination 625 were successful; 300 had attended a coaching class and of these 180 came out successful. Test for the association of attributes attending the coaching class and success in the examination.

Solution:

N = 1800

A: Success in examination

α: No success in examination

B: Attended the coaching class

β: Not attended the coaching class

(A) = 625, (B) = 300, (AB) = 180