If the population kurtosis of the observations 16,12,6,2,4,10 is 1.7414, then population kurtosis of the 8,6,3,1,2,5 is

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  1. 0.8707
  2. 0.43535
  3. 3.4828
  4. 1.7414

Answer (Detailed Solution Below)

Option 4 : 1.7414
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Detailed Solution

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The correct answer is 1.7414

Key Points

  • Kurtosis = Fourth Moment / (Second Moment)2 

 

  Variable (x) Deviation(x - x̄) Deviation2 Deviation4
  8 3.8333 14.6944 215.9267
  6 1.8333 3.3611 11.2971
  3 -1.1667 1.3611 1.8526
  1 -3.1667 10.0278 100.5563
  2 -2.1667 4.6944 22.0378
  5 0.8333 0.6944 0.4823
SUM 25 0 34.8333 352.1528
SUM/n x̄ = 4.1667 0 5.8056 58.6921

 

Kurtosis = 58.6921/(5.8056)2 

Kurtosis = 1.7414

Important Points

  • An attribute of a dataset can be described using the statistical measure kurtosis. On a graph, regularly distributed data typically resembles an upside-down bell when plotted. The bell curve is a name for this. The tails on either side of the curve are often formed by the plotted data that are most dispersed from the data mean. Kurtosis reveals how much information is included in the tails.
  • Leptokurtic (below normal), platykurtic (above normal), and mesokurtic (normal) are the three categories of kurtosis (more than normal). 
  • Only when combined with standard deviation is kurtosis beneficial. Even if an investment has a high kurtosis (poor), the overall standard deviation is likely to be modest (good). On the other hand, a low kurtosis (excellent) investment could have a large total standard deviation (bad).

Hence, if the population kurtosis of the observations 16,12,6,2,4,10 is 1.7414, then the population kurtosis of the 8,6,3,1,2,5 is 1.7414

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