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Most language is just inherently ambiguous, unavoidably so.
In most cases it is less than clear that graphs and tables are identical, if for no other reason than the perceptual mechanisms involved to see and interpret are quite different. This notion has been around for centuries, and is strongly seated in the quantitative trades. It simply is not true, except in limited circumstances. For example, in work I have done in developing and defining market segments, the analysis of 2,000 cases provides highly unreliable results, as, in fact, does the analysis of 10,000 cases. With the analysis techniques I use, I need about 60,000 to 70,000 cases.