Asked by Sammy
Sample: 4 5 3 6 5 6 5 6
When I do the long method for sample variance I got 1.14, but when I tried the shortcut method, it is giving me a different answer..
s^2= (1/n-1)(Σ xi^2-(Σ xi^2)/n))
s^2= 1/7[208-(1600/7)]
s^2= -2.93
I am not sure what is going wrong..
When I do the long method for sample variance I got 1.14, but when I tried the shortcut method, it is giving me a different answer..
s^2= (1/n-1)(Σ xi^2-(Σ xi^2)/n))
s^2= 1/7[208-(1600/7)]
s^2= -2.93
I am not sure what is going wrong..
Answers
Answered by
oobleck
Hmmm. Parentheses make a difference. Try
1/(n-1) (Σx^2 -(Σx)^2/n)
1/(n-1) (Σx^2 -(Σx)^2/n)
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