statistical inference Flashcards
1
Q
what is probability?
A
measure of how likely it is that some event will occur
2
Q
what is a type 1 error
A
reject null when we should not
3
Q
what is a type 2 error?
A
fail to reject the null when we should
4
Q
why is the alpha level 0.05?
A
our inference is wrong 5% time
find significance wrongly 5 times / 100
5
Q
why can’t reduce the alpha level?
A
decreasing likelihood of type 1 error increase likelihood of type 2 error
6
Q
what is directional hypothesis
A
one tailed
usually based on previous research
7
Q
what is a non directional hypothesis?
A
two tailed
no predicition on results
8
Q
A
