Statistics Flashcards by Kelly Strecker

Q

Standard deviation

A

S=[(1/(n-1))SUM(X-X’)^2]

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Q

Sample mean

A

1/nSUM(X)

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Q

Population

A

Group of interest

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Q

Sample

A

Subset of the population

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Q

Normal distribution

A

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Q

Norma distribution

A

X’-Z_α/2(σ/(n^.5))<X’+Ζ_α/2(σ/(n^.5))

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Q

ME

A

(Z_(α/2)*σ)/(n^.5)

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Q

Z_(α/2) at 90% confidence

A

1.6449

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Q

Z_(α/2) at 95% confidence

A

1.9600

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Q

Z_(α/2) at 98% confidence

A

2.3263

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Q

Z_(α/2) at 99% confidence

A

2.5758

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Q

ME when μ is at low or high end

A

X’-μ

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Q

Sample size (n)

A

n = ((Z_α/2*σ)/ME)

OR

n = ((Z_α/2*σ)/(X’-μ))

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Q

Sample Correlation Coefficient

A

r = S_xx/((S_xx*S_yy)^.5)

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Q

Coefficient of Determination

A

r^2

Aka

Square of sample correlation coefficient

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Q

S_xx

Study These Flashcards

A

SUM(xy)-(1/n)(SUM(x))(SUM(y))