1. I agree that the line graph would be best to show membership trends over the course of the year, as this graph features overall trends and patterns.
2. Yes, my answer would change because if I’m graphing trends for employees, spouses, and dependents, a line graph might get too visually unwieldy. I would, instead, use a vertical bar graph, where each point in time would be associated with 3 differently colored bars, representing Employee, Spouse, and Child. I like Rachel’s suggestion above to use quarters as the “points in time” since Flores del Mundo’s data will be collected, eventually, over many years, and you don’t want the graph to get too unwieldy.
3. Yes, my answer would again change. Just showing Eastern and Northern on the same graph would not make the line graph too visually unwieldy, so I could go back to using a line graph to depict the data and show overall trends over time.