When a lot of bars are drawn in at the same time, the audience's cognitive capacity is diverted to the graphs, and you as the speaker is ignored. You've given them an issue to solve — what actually does the data imply – and they are frantically attempting to come up with the right answer. As a result, up the stakes. Bring just one set of data at a time and highlight a few spots. It is tough to get all these things right in one try, so most of the businesses just choose to hire a…