Distributions Flashcards
1
Q
4 colors of a piece X
3 of Y
2 of Z
How many sets of xyz can we make?
A
4x x 3y x 2z
2
Q
3 analysts
3 indexes
How many ways to analize the index?
A
3!
3
Q
S^2
A
Ę(xi-x)^2/n-1
4
Q
Var is unknown
N>30
A
Z stat
5
Q
N<30
A
T stat
6
Q
P(R)
A
X- M/st dev/n^1/2
7
Q
Confidence interval formula
A
X+/- z x s/n^1/2
8
Q
St error
A
St dev/n^1/2
9
Q
Z =
A
Z= X-M/st dev
Whereas Z is a number of deviations away from a mean
10
Q
Test Statistics
A
X-M/(s/n^1/2)
11
Q
Type 1 error
A
Reject a true hypothesis
12
Q
Type 2 error
A
Reject false null Hypothesis
13
Q
Power of a test
A
P(1-ß)
14
Q
P-value
A
It is a min lvl of significance at which we reject hypothesis
15
Q
F statistics
A
Use it when known Var
