Sign Test Flashcards
1
Q
define inferential statistics
A
draw conclusions about data
If results are down to chance or meaningful / significant
2
Q
what does inferential statistics tell us?
A
whether results are significant enough to be generalised
3
Q
what is inferential statistics based around?
A
probability
low probability of results being down to chance = generalisable
4
Q
when can we accept the alternative hypothesis?
A
when sign test shows results being significant
5
Q
when do we accept a null hypothesis?
A
when results are not significant
6
Q
when is a test significant?
A
if it meets the level of probability
7
Q
what are the levels of probability for significance?
A
5%
1% for medicine
8
Q
step by step how to do the sign test?
A
- record +,-,0 difference
- find observed value (S)
- directional / non-directional hypothesis
- Significance level = 5% (0.05)
- calculate N
(no. participants - no difference) - use table to find out critical value
9
Q
when is a test significant?
A
observed value equal to or less than critical value
