We are presenting in the accompanying chart the achievement test scores for 15 trainees assigned to three different training methods. Each method was taught to 5 trainees. Therefore it is an experiment of comparing three populations by selecting independent samples. Use a Kruskall- Wallis test to test the null hypothesis that the populations have the same median, with alpha=0.05.
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Method 1
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Method 2
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Method 3
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Score
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Rank
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Score
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Rank
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Score
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Rank
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86
|
|
90
|
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82
|
|
|
79
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76
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68
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|
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81
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88
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73
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|
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70
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82
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71
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|
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84
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89
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81
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a) Compute H = ______________________
b) Compute the Chi-Square Critical value ________________________
c) Statistical Decision __________________ ( Reject Ho, Fail to reject Ho)
d) The medians are not significantly different ____________________ (True, False)