Chapter 2: Basic Statistics Flashcards
1
Q
Covariance of independent variables:
A
ZERO
2
Q
Population Mean:
A
E(X)=Summation of xi*pi
3
Q
Sample Mean:
A
xbar=1/n*Summation of xi
4
Q
Population Variance:
A
Var(X)=E(X-E(X))^2
5
Q
Sample Variance:
A
Var(x)head=1/(n-1)*Summation of (xi-xbar)^2
6
Q
Population Covariance:
A
Cov(X,Y)=E((X-E(X))*(Y-E(Y)))
7
Q
Sample Covariance:
A
Cov(X,Y)head=1/(n-1)*Summation of (xi-xbar)(yi-ybar)
8
Q
Population Correlation Coefficient:
A
Corr(X,Y)=Cov(X,Y)/Square of (Var(X)*Var(Y))
9
Q
Sample Correlation Coefficient:
A
Corr(X,Y)head=Cov(X,Y)head/Square of (Var(X)head*Var(X)head)