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
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