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Model Paper 1 — Economics STD 11 Commerce — Question

CBSE BoardEnglish MediumSTD 11 CommerceEconomicsModel Paper 11 Mark
MCQ
When the mean of series is a decimal number, then which method should be used for computing Karl Pearson’s coefficient of correlation?
  • A
    Step Deviation Method
  • B
    Short-cut Method
  • C
    Indirect method
  • D
    Direct Method
✓

Answer

(b) Short-cut Method
Explanation: To avoid difficult calculations due to mean being in fraction, deviations are taken from assumed means while calculating coefficient of correlation. The formula is also modified for standard deviations because deviations are taken from assumed means.

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