What is the variance of {-4, 5, -7, 0, -1, 10}?
1 Answer
Variance (
Explanation:
Population data:
Sum of population data:
Population size:
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Mean:
Deviations from Mean:
Squares of Deviations from Mean:
Sum of Squares of Deviations from Mean:
Variance:
Of course we would not normally do all these steps manually
(the above was strictly for educational purposes)
We would normally use a calculator or spreadsheet with a built in function as:
If you wanted the Sample Variance
#sigma_"sample"^2 = ("sum of squares of deviations from mean")/("population size"-1)#
and- the (Excel) spreadsheet built-in function is VAR(A2:A7)