Business Statistics

Chapter 18 | Non-Parametric Statistics 697

Wilcoxon statistic T = Minimum of (T

+

, T

–

)

T

+

= 1 + 3 + 6 = 10

T

–

= 2 + 4 + 5 + 7 + 8 + 9 + 10 = 45

T = Minimum of (T

+

, T

–

) = Minimum of (10, 45) = 10

Step 7: Arrive at a statistical conclusion and business implication

At 95% ( = 0.05) condence level, the critical value of T is 8. The computed

value of T is 10 (which is greater than 8); therefore, the decision is to accept the

null hypothesis and reject the alternative hypothesis.

We can say that training has not signicantly improved the efciency levels

of employees. Figures 18.19 and 18.20 are the Minitab and SPSS output, respec-

tively, for Example ...