Statistics Flashcards
1
Q
Standard deviation
A
S=[(1/(n-1))SUM(X-X’)^2]
2
Q
Sample mean
A
1/nSUM(X)
3
Q
Population
A
Group of interest
4
Q
Sample
A
Subset of the population
5
Q
Normal distribution
A
6
Q
Norma distribution
A
X’-Z_α/2(σ/(n^.5))<X’+Ζ_α/2(σ/(n^.5))
7
Q
ME
A
(Z_(α/2)*σ)/(n^.5)
8
Q
Z_(α/2) at 90% confidence
A
1.6449
9
Q
Z_(α/2) at 95% confidence
A
1.9600
10
Q
Z_(α/2) at 98% confidence
A
2.3263
11
Q
Z_(α/2) at 99% confidence
A
2.5758
12
Q
ME when μ is at low or high end
A
X’-μ
13
Q
Sample size (n)
A
n = ((Z_α/2*σ)/ME)
OR
n = ((Z_α/2*σ)/(X’-μ))
14
Q
Sample Correlation Coefficient
A
r = S_xx/((S_xx*S_yy)^.5)
15
Q
Coefficient of Determination
A
r^2
Aka
Square of sample correlation coefficient
