Download Mean Variance Standard Deviation Population = ∑ = ∑ − = Sample

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Mean
Population
=
Sample
̅=
Sampling
distribution
of the mean
̅ ̅=
∑
∑
∑
Variance
=
=
Standard Deviation
∑
−
=
∑
− ̅
−1
=
=
̅
=
̅
Or
̅
≅
Where n is the sample size
=
√
=
√
Or
̅
≅
This standard deviation
has a special name: it is
called the Standard Error
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