Business Statistics

Chapter 18 | Non-Parametric Statistics 703

18 C2. Use the Wilcoxon test to analyse the following scores ob-

tained from 16 employees (selected randomly) before and

after a training programme. Use  = 0.05

Employees Scores before training Scores after training

1 30 25

2 31 34

3 32 37

4 29 33

5 30 28

6 28 34

7 27 31

Employees Scores before training Scores after training

8 34 28

9 33 30

10 32 26

11 31 36

12 29 38

13 28 35

14 27 22

15 26 22

16 29 25

18.5 KRUSKAL–WALLIS TEST

The Kruskal–Wallis test is the non-parametric alternative to one-way ANOVA. There may be cases

where a researcher is not clear about the shape of the population. In this situation, the Kruskal–W ...