alleryPearson's r between x = 1, 2, 3 and y = 2, 4, 6 is
A0
B-1
C0.5
D1
Answer & Solution
Correct answer: D. 1
1. y = 2x for every pair, a perfect linear relation with positive slope.
2. By definition, perfect positive linear relation gives r = +1.
3. Numerator and denominator of the r formula coincide exactly.
4. So r = 1.
_Source: ICAI BoS Foundation Paper 3, Ch 17 'Correlation', p.5_
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