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Measures of dispersion Standard deviation (from the mean) ready.

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Presentation on theme: "Measures of dispersion Standard deviation (from the mean) ready."— Presentation transcript:

1 Measures of dispersion Standard deviation (from the mean) ready

2 Mean = 2 + 3 + 7 3 = 4 Data: 2; 3; 7 02468

3 Deviation from mean ready 02468 3 -2 Data: 2; 3; 7

4 Mean deviation from mean ready ++ = 0 3 A l w a y s 0 - N o t v e r y u s e f u l ! 02468 3 -2 Data: 2; 3; 7 3(-2)(-1)

5 02468 3 -2 Data: 2; 3; 7 ready 3(-2)(-1) Deviation

6 02468 3 -2 Data: 2; 3; 7 ready 22 3(-2)(-1) 2 Square of deviation

7 02468 3 -2 9 4 1 Data: 2; 3; 7 ready 22 3(-2)(-1) 2 Square of deviation

8 02468 3 -2 d  n 2 Mean square of deviation 9 4 1 14 3 3 Data: 2; 3; 7 ready 3 22 ++ 3(-2)(-1) 2 Mean square of deviation 14 3 =

9 02468 3 -2 d  n 2 2.2 Mean square of deviation 9 4 1 14 3 Root of mean square of deviation 3 = 2.2 Data: 2; 3; 7 ready 3 22 ++ 3(-2)(-1) 2

10 02468 3 -2 d  n 2 = standard deviation 2.2 Mean square of deviation 9 4 1 14 3 Root of mean square of deviation 3 = 2.2 Data: 2; 3; 7 ready 3 22 ++ 3(-2)(-1) 2

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