Find the sample variance s2 for the given data Round your fi
Find the sample variance s2 for the given data. Round your final answer to two decimal places.
2, 5, 10, 7, 8
A) 7.44 B) 2.73 C) 3.05 D) 9.30
Solution
Getting the mean, X,
X = Sum(x) / n
Sum(x) = 32
As n = 5
Thus,
X = 6.4
Setting up tables,
x x - X (x - X)^2
2 -4.4 19.36
5 -1.4 1.96
10 3.6 12.96
7 0.6 0.36
8 1.6 2.56
Thus, Sum(x - X)^2 = 37.2
Thus, as
s^2 = Sum(x - X)^2 / (n - 1)
As n = 5
s^2 = 9.3 [answer, variance, OPTION D]
