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Table 4 Descriptive statistics about the usability and its sub-factors

From: Reusable content matters: a learning object authoring tool for smart learning environments

Sub-factors N Mean Standard Deviation Min Max
Visual Sufficiency and Stability 20 2.55 .30 1 3
Error Messages and Technical Sufficiency 20 2.42 .55 1 3
Interface-Task Performance 20 1.45 .45 1 3
Interface-Process Performance 20 1.29 .21 1 3