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I have only encountered them during my time as an MPH student. I think histograms are easy to understand and box-whisker plots can be easily digested with some explanations.
A bar graph is the best type of graph to show ranking, you can rank data in an ascending or descending order so that it can be easier to show and highlight high and low values of data at a glance. for both Eastern and Northern Zones Curative Care visits that falls under Professional care would be at the top of the list and Inpatient Medical which is under Inpatient would be at the bottom of the list if the most and less frequented service categories were ranked.
I think that a line graph is a good choice because it shows trends over a period of time, in this case over a year. It can show the months of low and high membership.
I would use a 2D bar chart for graphing total membership because I would just be comparing membership between employee/spouse and child. One bar graph would be used to show both Eastern and Northern because it would be the best way to show how the Eastern was doing compared with the Northern.
