Great topic, something non technical for once
I do a lot of reports and presentations and I get mixed messages and sometimes question wonder if I was too detailed or not as detailed...
What I have learned, the more data points the more quesitons are asked and this can lead to more work! but at the same time I find it providing more valuable insight in the end. But of course you need to be careful, showing too many data points some people may not get it.
I stick with the rules of 3, 3 topics/subjects, 3 bullet points and that seems to open a lot of interactivity. Also stating to your audience you will take them through "3" areas of interest and reaffirming the 3 areas it seems to stick in their minds and they can follow easier.
When doing charts, keep it clean and basic. I always get rid of the background lines, depending on your audience I keep the color theme consistent with the business or audience I am presenting to. I never use animation or any fancy graphics which could draw away from what I am showing.
3 bullet points about the data, short and crisp. Let the audience ask the questions but of course elaborate on your bullet points, try not to be a slide reader.
I have a six sigma and Itil background, but I find it difficult to communcate these points to folks that are not well versed in data or these methods, so I avoid them other than using variance and standard devation.
I think a simple bar or pie chart tells the story in very clear picture. Also anything complex or detailed I embed a file so they can look at the details later, it also supports your data points.
When using MS Office, use the option to check your "private" data and remove it before sending. You wouldn't want the Author, Location last saved, Manager, tags etc.. or other company/personal info getting out.