The analysis of the t-test for standard deviations of DEF failures in 2010–2014 for 24 h+, 24 h−, 48 h+, 48 h−, 72 h+ and 72 h−.
|Variable||Normality||Homogeneity of variance||n||SD||t-test|
|SD 24 h+||W = 0.92||18||23.27|
|p = 0.12||F = 6.75||t = 3.76|
|SD 24 h−||W = 0.91||p = 0.0003||18||7.42||p = 0.0006|
|p = 0.10|
|SD 48 h+||W = 0.96||18||20.26|
|p = 0.62||F = 2.38||t = 1.88|
|SD 48 h−||W = 0.96||p = 0.08||18||14.16||p = 0.07|
|p = 0.54|
|SD 72 h+||W = 0.95||14||16.80|
|p = 0.53||F = 2.75||t = 1.92|
|SD 72 h−||W = 0.89||p = 0.08||14||11.44||p = 0.07|
|p = 0.09|
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