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CA Foundation · Quantitative Aptitude · Correlation and Regression

For 8 paired observations, every pair of deviations moves in opposite directions, so there is no concurrent deviation (C = 0). What is the coefficient of concurrent deviation?

The coefficient is −1. With 8 observations N = 7 and C = 0, so (2C − N)/N = −7/7 = −1. Since this is negative, rc = −√1 = −1, showing perfect inverse direction of movement.

  1. A-1Correct
  2. B0
  3. C+1
  4. D-0.5

Explanation

With 8 observations, N = 7 and C = 0. Then (2C − N)/N = (0 − 7)/7 = −1, which is negative, so rc = −√1 = −1. The value 0 arises only when C = N/2, which is not the case here.

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