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Question

Find the association between intelligence of fathers and the intelligence of sons from the following data:
Intelligent fathers with intelligent sons: 50
Dull fathers with intelligent sons: 100
Dull fathers with dull sons: 300
Intelligent fathers with dull sons: 200

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Solution

Let A denote the intelligence of father’s and B denote the intelligence of Son’s

Then, we know that

Yules’s co-efficient of association is

Q=(AB).(αβ)(Aβ).(αβ)(AB).(αβ)+(Aβ).(αβ)

=50×300200×10050×300+200×100

=150002000015000+20000

=500035000

=17

=0.428

There is a negative association between the intelligence of father’s and son’s
1134303_1197953_ans_05c26f63617a4ba58852dd31f80bb0b5.png

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