Inferential tests : Sign test

What are the 3 criteria for deciding what stat test to use?

-Experimental design

-Data

-Differentiation or correlation

What are

-Experimental design

-Data

-Differentiation or correlation

3 criteria for choosing what stat test to choose

What 3 criteria are needed to use a sign stat test?

-Repeated measures or matched pairs design

-Nominal data (data in categories)

-Needs to be a test of difference (not association)

What is

-Repeated measures or matched pairs design

-Nominal data (data in categories)

-Needs to be a test of difference (not association)

3 criteria needed to use a sign stat test

What is nominal data?

Data in categories

Steps of Sign Stat test (5)

1. Take each the value away from the other one (q tells u which one to do)

2. Count no of + and no of - (any = are removed from consideration since show no difference)

3. Choose the less frequent sign and name it S eg: S = 7. This is observed value

4. Compare observed value to critical value using correct criteria (level of significance, no of Ps, one tailed (non-directional) or two tailed hypothesis (directional)

5. Observed value must be equal to or less than critical for it to be significant

What is step 1 of doing a sign stat test?

Take 1 value away from the other (q tells u which one to do)

What is step 2 of doing a sign stat test?

Count no. of + and - and discard any = from consideration

What is step 3 of doing a sign stat test?

Choose the less frequent sign and call it S

What is step 4 of doing a sign stat test?

Compare observed value to critical value in critical values table using correct criteria

What is step 5 of doing a sign stat test?

Observed value must be equal to or less than critical value to be significant