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Reaction times of assembly line workers: Kruskal-Wallis Test

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An industrial psychologist wants to test whether the reaction times of assembly line workers are equivalent under three different learning methods. From a group of 25 new employees, 9 are randomly assigned to method A, 8 to method B and 8 to method C. After the learning period the workers are given a task to complete, and their reaction times are measured as shown in the table below. What is the appropriate test statistic to use for measuring whether there is a significant difference between the median reaction times for these learning methods at a significance level of 0.01?

2 1 5
3 6 7
4 8 11
9 15 12
10 16 13
14 17 18
19 21 24
20 22 25

A. X2 = 9.210
B. X2 = 5.991
C. H = 0.12
D. H = 0.64

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Reaction times of assembly line workers: Kruskal-Wallis Test.

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D. H = 0.64


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