Question

Suppose a population A has 100 observations 101, 102, ... , 200, and another population B has 100 observations 151, 152, ... , 250. If VA and VB represent the variances of the two populations, respectively, then VA/VB is

Answer 1

1) 1
2) 9/4
3) 4/9
4) 2/3

Answer 2

do you have the formula for calculating the variance ?

Answer 3

no sir i am beginner in these type of questions

Answer 4

well how does your teacher expect you to do statistics without giving you the basic formulas?

Answer 5

sir got to go now , please please post the solutions if possible or i would get the help after some time ( tomorrow - indian standard time )

Answer 6

variance of x1,x2,x3,x4,...xn is
first find mean 'm'
then find square of each value - m ie (x1-m)^2
and sum of all these and then again divide with n
in siimple formula its
\[(\sum_{i=1}^{n}(X_{i}-mean(Entire. values))^2 ) /n\]
so first u need to find mean of two sets