statistical testing : the sign test

Question 1

what do we need in order to use a sign test

Answer 1

1. test of difference
2. repeated measures design
3. nominal data

Question 2

what is the accepted level of probability

Answer 2

0.05
5%

Question 3

who do you need to find your critical value

Answer 3

1. significance level
2. number of participants in the investigation (N value)
3. whether the hypothesis is directional or non directional

Question 4

how to carry out the sign test

Answer 4

1. work out the difference between the conditions
2. if positive put a + if negative put a - , ignore the ones that stay the same
3. count your + and ur - signs
4. the smaller number is the calculated value
5. compare the calculated value to the critical value

Question 5

when is the sign test significant

Answer 5

• calculated value had to be equal to or lower than the critical value
• reject the null hypothesis