Home › CA Foundation › quantitativeaptitude › Correlation and Regression › If r = +1, the correlation is
If r = +1, the correlation is
AWeak positive
BPerfect negative
CPerfect positive
DNo correlation
Answer & Solution
Correct answer: C. Perfect positive
1. The value of r measures linear association.
2. r = +1 implies all points lie exactly on a line with positive slope.
3. This is called perfect positive correlation.
4. So the answer is 'perfect positive'.
_Source: ICAI BoS Foundation Paper 3, Ch 17 'Correlation', p.5_
Related questions
If r = -0.7 and sigma_y = 10, sigma_x = 5, then byx equalsIf byx = 1.6 and bxy = 0.4, the value of r isIf x = 5y + 10 is the regression of x on y, then bxy equalsIf r = 0.8, byx = 0.4, then bxy equalsCoefficient of determination r^2 of 0.81 means proportion of variation explained equalsSpearman's rank correlation for ranks (1,2,3) and (3,2,1) of three subjects isTwo regression lines are perpendicular whenPearson's r between x = 1, 2, 3 and y = 2, 4, 6 is