how to teach stats to people no good at maths

I looks like I am going to be lecturing basic stats. I think I will drop assesments on how to find quartiles since there are six different methods so arguing about it wastes time. If they can find the median and know it is the 50th percentile then they should know what a 25th and 75th percentile is.
As for defining variable types I think I will do it quickly and then revist it after they have done some work in excel and have to work out when to do a test of proportions and when to do a for means.