Paper 1 · Research Aptitude
Which of the following correlation values is the strongest?
A+0.10
B-0.95
C+0.90
D-1.00 ✓ Correct
Correct answer: (D) -1.00 — The correlation value -1.00 is the strongest, so that is the answer.
Explanation
★The correlation value -1.00 is the strongest, so that is the answer.
★The strength of a correlation is shown by how far it is from zero, that is, its absolute value.
★A value of -1.00 has an absolute value of 1, the largest possible, so it is the strongest.
★It represents a perfect relationship, even though its direction is negative.
★The values +0.90 and -0.95 are strong but a little below 1 in absolute size.
★The value +0.10 is very weak, so -1.00 is the strongest correlation.
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