Home › CA Foundation › Quantitative Aptitude › Correlation and Regression › If r = -1, the correlation is
If r = -1, the correlation is
AZero correlation
BPerfect negative
CWeak negative
DPerfect positive
Answer & Solution
Correct answer: B. Perfect negative
1. r ranges over [-1, +1] for linear correlation.
2. r = -1 implies all points lie on a line with negative slope.
3. This is called perfect negative correlation.
4. So the answer is 'perfect negative'.
_Source: ICAI BoS Foundation Paper 3, Ch 17 'Correlation', p.5_
Related questions
The side opposite one acute angle of a right triangle is, for the other angle, the:Cosecant, secant and cotangent are described as the reciprocals of the:Tangent is the ratio of the opposite side to which side?Positive reference angles have terminal sides lying in which quadrant?A reference angle is the smallest positive acute angle formed with which axis?One radian is the central angle intercepting an arc equal in length to the:Cosine is the ratio of the hypotenuse and which side?How many coterminal angles does any angle have?