Should we show graphs using horizontal lines like this:
Or using “slanted” lines like this? :
Notice that these two graphs actually are showing the same data, just differently.
I’ll argue that it does matter which way we show graphs, and that the correct graphical representation depends on the data the graph is showing.
First, keep in mind that the graph shows values for points in time. E.g. in both graphs, the value at 5:40 was measured to be approx 750,000.