NDA Government Jobs Exams Numerical Ability Probability

If two lines of regression are perpendicular, then the correlation coefficient r is
(a) 2 (b)
1/2 (c) 0 (d) None of the above

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(c) 0 negative correlation coefficient
7 years agoHelpfull: Yes(0) No(0)

NDA Other Question

Variance is always independent of the change of
(a) origin but not scale (b) scale only (c) both origin and scale (d) None of the above The standard deviation of the observations 5, 5, 5, 5, 5 is
(a) 0 (b) 5 (c) 20 (d) 25