✓ Inferential Statistics - calculating the sign test (AO1)

Question 1

What is step 1 of calculating the sign test?

Answer 1

work out the s value:
- compare your 2 conditions = work out if the change is a +/-
- if no change write = (& ignore ppt)
- doesn’t matter which way round as long as you are consistent
- count up your + & -
- the smaller value is your S value

Question 2

What is step 2 of calculating the sign test?

Answer 2

work out the critical value:
- need to know…

• if it’s a one/two-tailed hypothesis (directional/non-directional)
• level of significance (default is p<_0.05)
• N (no. ppts) & don’t count =

Question 3

What is step 3 of calculating the sign test?

Answer 3

compare:
- compare your calculated value (S) to the critical value in the table