ผลต่างระหว่างรุ่นของ "Week11 practice 2"

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(หน้าที่ถูกสร้างด้วย '== Sample == Suppose that you take <math>n</math> samples <math>X_1,X_2,\ldots,X_n</math> independently from the same distribution. ==...')
 
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=== Sample means ===
 
=== Sample means ===
  
The statistic <math>\bar{X} = \frac{1}{n}\sum_{i=1}^n X_i</math> is called a '''sample mean.'''
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The statistic  
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<center>
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<math>\bar{X} = \frac{X_1+X_2+\cdots+X_n}{n} = \frac{1}{n}\sum_{i=1}^n X_i</math>  
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</center>
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is called a '''sample mean.'''
  
 
=== Sample variances and sample standard deviations ===
 
=== Sample variances and sample standard deviations ===

รุ่นแก้ไขเมื่อ 01:29, 6 พฤศจิกายน 2557

Sample

Suppose that you take samples independently from the same distribution.

Sample means

The statistic

is called a sample mean.

Sample variances and sample standard deviations