24. Wilcoxon & The Sign Test

Question 1

What is the Wilcoxon test

Answer 1

The Wilxcoxon test is a test of difference for related data.

Question 2

When is the Wilcoxon test used

Answer 2

• A hypothesis states that there’ll be a difference between 2 sets of data.
• The data is ordinal.
• The experiment is a repeated measures or matched pairs design.

Question 3

See pg128 for worked eg on Wilcoxon test

Question 4

What is the Sign test

Answer 4

• The Sign test is one of the easiest statistical tests.
• It compares scores in data from repeated measures or matched pairs designs by turning the change in scores into nominal data.

(may be asked calculate the observed value here, so make sure to learn method, DONT NEEED TO KNOW METHOD FOR THE OTHER TESTS).

Question 5

How to calculate the observed value for the Sign test

Answer 5

1. Find & state the difference between the two scores (+ or -).
2. Add up the number of + signs & - signs. The smaller one is the observed value.

on pg129

Question 6

See pg129 for worked eg on the Sign test