Statistics Flashcards
1
Q
If it asks you to comment on the results of a test
A
Compare to prior
2
Q
When finding the MLE
A
Differentiate again to make sure it is a max
3
Q
When asked about sufficiency
A
Always factorise and say explicitly what T is
4
Q
If adding a random variable on to some iids
A
P(Xn+1>c|a) or whatever the condition is, gets included in the product in the likelihood
5
Q
The ‘sample mean’ of u
A
is u
6
Q
Dont forget that variance is sigma^2
A
So when using t’s know when to square
7
Q
Normal distribution will have the same EQT and HPD because
A
It is symmetric and unimodal
8
Q
If X ~Bin(n,p) then for n large enough we have
A
X~N(np,np(1-p)) where n is large and p is not too far away from 0.5 and a sample proportion phat = X/n has distribution phat~N(p,p(1-p)/n)
