the sign test

Question 1

when to use

Answer 1

-ToD -nominal data. -related design

Question 2

step 1

Answer 2

• Work out the difference between the two sets of data.

You don’t need the exact figures. + or - will do.
• It also doesn’t matter which column is subtracted from which.

Question 3

step 2

Answer 3

• Add up the total number of +’s and -‘s.
• + = 5
• - = 3
• Where there is no difference the data can be ignored.
-For all intents and purposes the participants are deleted.

Question 4

step 3

Answer 4

• The less frequent sign is your S
value
• S = 3
• This is your calculated value.
• Your N value (participants) is the number of participants not including the 0 values.
• N=8

Question 5

step 4

Answer 5

• Compare your calculated value (S=3) to your critical value.
• The critical value can be found in the critical values table, which will be given to you.
• Is your test 1-tailed or 2-tailed?
° 2-Tailed - non-directional hypothesis
• What is the significance level being used?
• P=0.05 as we haven’t been told anything different.
• How many participants are there?
• N=8

Question 6

answer

Answer 6

The calculated value (S=3) is greater than the critical value of 0.
Therefore the difference in depression score before and after therapy is not significant.