Skip to content

CA Foundation · Quantitative Aptitude · Correlation and Regression

In a concurrent deviation study of 11 paired observations, the number of concurrent deviations is c = 3. What is the value of the coefficient of concurrent deviation?

With 11 observations N = 10, and 2c − N = 6 − 10 = −4. Since this is negative, the coefficient is −√(4/10) = −√0.4, about −0.632, showing moderate negative association.

  1. A-√0.4Correct
  2. B+√0.4
  3. C-0.4
  4. D-√0.6

Explanation

Number of pairs of deviations N = 11 − 1 = 10. 2c − N = 6 − 10 = −4, which is negative, so r = −√(−(2c−N)/N) = −√(4/10) = −√0.4 ≈ −0.632. Using +√0.4 ignores the negative sign; using N = 11 is the wrong base.

Did you get it right without looking?

One question tells you little. A timed set on Correlation and Regression shows your real accuracy, how long you take and where you lose marks.

Practise Correlation and RegressionFree diagnostic mock

More Correlation and Regression questions