Significant 2
Significant 2 : Measured differences in the properties of material are said to be significant if the chances of their being real differences, not attributable to chance variations, are at a pre-selected acceptably high level. Usually a difference is said to be significant if we can be 95 per cent sure that it is real. A "significant" difference is not necessarily a difference that would be important from a practical point of view, i. e. a difference may be quite real, and therefore mathematically significant, while being so small in value as to be negligible from the point of view of practical selection between materials for a specific purpose
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