probability and significance Flashcards
1
Q
what is a null hypothesis?
A
- no difference between conditions
- stat tests determine whether this should be accepts or rejected
2
Q
what is the level of significance/ probability?
A
point at which alternative hypothesis id accepted (usually greater than 0.05)
3
Q
what is the critical value?
A
cut off point between acceptance and rejection of hypotheses
4
Q
when should one tailed test be used?
A
when hypothesis is directional
5
Q
when should 2 tailed test be used?
A
when hypothesis is non directional
6
Q
what is usual level of significance?
A
- (p) value - 0.05/ 5%
- 0.01 for things with human cost
7
Q
what is type 1 error?
A
null hypothesis rejected when it should have been accepted (false positive)
8
Q
what is type 2 error?
A
null hypothesis accepted when it should have been rejected (false negative)
