Middle Ages end close to the end of the 16th. cent., which is just about when writing and reliable records of that writing begin. Statistics are much more complicated than speech, so I'd have to say that such stats would have begun, if they even did, long after any battle axes were used...much. Sorry, interesting Q.
These graphs CAN show you patterns over time as long as one of your axes shows time (usually the x axis). However it is easier to see trends over time if you use a line graph, and this is more common.
They show a comparison between the two graphs. They can show the intersection of the two graphs.
All graphs show patterns. Bar charts are one way to show comparisons between groups.
Well we use graphs to show parts compared to the whole. Graphs are important because they can show us percents, they can show us how much of something or whatever you may be talking about. For example, graphs are used to show the percent of people voting for which candidate in this years election.
They both show a set of data. Line graphs show data over time. Pie graphs show percentages in data.
yes
yes
line graphs show a change over time
The Y axes and the X axes.
Show me the graphs and I'll get right on it for you.
yes
yes