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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?

    METHOD
    A B C
    2 1 5
    3 6 7
    4 8 11
    9 15 12
    10 16 13
    14 17 18
    19 21 24
    20 22 25
    23

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

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    D. H = 0.64

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