Stats Flashcards
1
Q
Bernoulli random variable - mean
A
E(X)=p
2
Q
Bernoulli random variable - variance
A
Var(X)=p(1-p)
3
Q
Binomial distribution - mean
A
=np
4
Q
Binomial distribution - variance
A
=npq
5
Q
Binomial distribution - standard deviation
A
=√npq
6
Q
Sample proportions - p̂
A
p̂=X/n
7
Q
Sample proportions - mean
A
E(p̂)=p
8
Q
Sample proportions - variance
A
Var(p̂)= pq/n
9
Q
Sample proportions - standard deviation
A
√npq / n
10
Q
A
∫ f(x) dx = 1 from -∞ to ∞
11
Q
PDF - mean
A
∫ x f(x) dx = 1 from a to b
12
Q
PDF median
A
∫ f(x) dx = 0.5
13
Q
PDF - variance
A
∫ x˄2 f(x) dx - 2μ
