Python Forum

Hello. So that I use that code

import numpy as np
import math
t=[0.10,0.15,0.16]
Y=10000000; n=56
t1=[0]*n
m=len(t)
t1[0:m-1]=t
s=math.sqrt(Y*(Y-n)/n*np.var(t1,ddof=1))
print(s)

and get that output as 41935.996676144765
But the correct answer should be as 42295,3075809521 .
How to get correct value of sampled variance?

You have an extra 0 at the end. That is, t1 is 57 items long not 56. If you take out the 57th number, you get the correct value. Line 7 should be t[0:m] = t.