Standard deviation, mean, etc? Flashcards

1
Q

Σ

A

the sum of

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2
Q

mean

A

x̄= Σχ/n

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3
Q

Σ(x-x̄)^2

A

this is called Sχχ

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4
Q

Easier way to write Sχχ

A

Σχ^2-nx̄^2

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5
Q

Standard deviation

A

σχ= √(Σ(x-x̄)^2)/(n-1)
=√(Sχχ)/(n-1)
=√(Σχ^2-nx̄^2)/(n-1)
Just so you know, on calc is called sχ for no reason

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