Question 1016869: I really need your help in solving this problem. I appreciate your time and efforts. Have a terrific day :) Here is the question:
Calculate SS variance, and Standard deviation for the following sample of
n = 4 scores: 3, 1, 1, 1,
(Note: the Computational formula works well with these scores.)
Yours,
Jay
Answer by rothauserc(4718)   (Show Source):
You can put this solution on YOUR website! The sum of squares(SS) is defined as the sum of (x - mean)^2 of all x
:
In our example the mean is (3 + 1 + 1 + 1) / 4 = 1.5
:
SS = (3 - 1.5)^2 + (1-1.5)^2 + (1-1.5)^2 + (1-1.5)^2 = 3
:
variance = SS / (n-1) = 3 / 3 = 1 where n = 4
:
std dev = square root(variance) = 1
:
|
|
|
