Chapter 2: Basic Statistics Flashcards

1
Q

Covariance of independent variables:

A

ZERO

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2
Q

Population Mean:

A

E(X)=Summation of xi*pi

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3
Q

Sample Mean:

A

xbar=1/n*Summation of xi

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4
Q

Population Variance:

A

Var(X)=E(X-E(X))^2

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5
Q

Sample Variance:

A

Var(x)head=1/(n-1)*Summation of (xi-xbar)^2

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6
Q

Population Covariance:

A

Cov(X,Y)=E((X-E(X))*(Y-E(Y)))

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7
Q

Sample Covariance:

A

Cov(X,Y)head=1/(n-1)*Summation of (xi-xbar)(yi-ybar)

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8
Q

Population Correlation Coefficient:

A

Corr(X,Y)=Cov(X,Y)/Square of (Var(X)*Var(Y))

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9
Q

Sample Correlation Coefficient:

A

Corr(X,Y)head=Cov(X,Y)head/Square of (Var(X)head*Var(X)head)

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