Exercise:
　　Assuming the distribution of A stock returns is a sample, what is the sample standard deviation?
 

Corp. Annual Stock Prices

2013.05

2013.06

2013.07

2013.08

2013.09

2013.10

20%

18%

12%

-3%

-8%

10%

　　{C}A.     {C}1.13%
　　{C}B.     {C}1.03%
　　{C}C.     {C}8%
　　{C}D.     {C}5%
 
　　Answer: A

 

　　相關(guān)知識(shí)點(diǎn)：Sample Mean and Variance
　　The sample mean is the sum of all values in a sample of a population divided by the number of observations in the sample. It is used to make inferences about the population mean.
　　The sample variance is the measure of dispersion that applies when we are *uating a sample of n observations from a population. Using n-1 instead of n in the denominator improves the statistical properties of s2 as an estimator of σ2.

{C}{C}

The sample standard deviation is the square root of the sample variance. 
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