The range and standard deviation of: 11,7,15, 3, 9.
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The range and standard deviation of: 11,7,15, 3, 9.

[From: ] [author: ] [Date: 12-05-18] [Hit: ]
s=12 / 2.326 = 5.159 aprox...s=raiz(80/4)=4.......
range = 15 - 3 = 12

There are tables giving d2 factors, applied to the range, to calculate, approximately, the standard deviation as the sample size n

s = ( R / d2)
of Table, n = 5 ; d2=2.326
s=12 / 2.326 = 5.159 aprox...

no table would result
mean x=(11+7+15+3+9)/5 = 9
Sum of squared deviations: = (11-9)^2 + (7-9)^2 + (15-9)^2 + (3-9)^2 + (9-9)^2 = 80
s=raiz(80/4)=4.472
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