Calculate SS variance and standard deviation for the followi
Calculate SS, variance, and standard deviation for the following sample of scores:
15, 16, 9, 1, 9
SS:
Variance:
Standard Deviation
Solution
Getting the mean, X,
X = Sum(x) / n
Sum(x) = 50
As n = 5
Thus,
X = 10
Setting up tables,
x x - X (x - X)^2
15 5 25
16 6 36
9 -1 1
1 -9 81
9 -1 1
Thus, Sum(x - X)^2 = SS = 144 [ANSWER, SS]
Thus, as
s^2 = Sum(x - X)^2 / (n - 1)
As n = 5
s^2 = 36 [ANSWER, VARIANCE]
Thus,
s = 6 [ANSWER, STANDARD DEVIATION]
