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Correlation — Economics STD 11 Commerce — Question

CBSE BoardEnglish MediumSTD 11 CommerceEconomicsCorrelation6 Marks
Question
Karl Pearson's Method is superior to Rank Correlation. Do you agree? Justify your answer.
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Answer

The Pearson correlation coefficient is the most widely used. It measures the strength of the linear relationship between normally distributed variables. When the variables are not normally distributed or the relationship between the variables is not linear, it may be more appropriate to use the Spearman rank correlation method. It gives an answer for any number fo figures while rank correlation can't be used if n is more than 30.
  1. If many numbers are repeating, it becomes still more difficult to use rank correlation.
  2. But if we do not know the figures but ranks, then it is advisable to use rank correlation.

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