sign test

Question 1

What is a sign test used for?

Answer 1

1. testing DIFFERENCE
2. with NOMINAL data
3. when using REPEATED MEASURE or MATCHED PAIRS

Question 2

How to calculate a sign test

Answer 2

1. convert data to nominal - sign of difference - subtract
2. add up pluses and minuses - any equal scores change the value of N
3. work out which sign is least frequent and use that number as calculated value
4. compare calculated value to critical value from table
5. see if results are significant or not

Question 3

Writing frame: Statement of significance

Answer 3

The critical value is … due to the P value being …
a …-tailed hypothesis and where N/df=…
The calculated/observed value (…) must be … than or equal to the critical value (…) to be significant.
In this case the results are … and we reject the … hypothesis and accept the …
So there IS/IS NOT a significant DIFFERENCE/CORRELATION between …