September 25, 2013
We have moved on from the exciting world of mean, mode and median to a hearty discussion on the complexities of different types of graphs.  There are quite a few.
Stem-and Leaf plot-Not the most accurate, easy to read graph ever produced, it's still pretty easy to make.  It might be good for things like comparing scores, and the frequency of scores, but other graphs can do that just as well. 

This is a basic image of one, and is pretty easy to figure out.  This might be data of test scores, or people's ages, or trips to the bathroom, for all I know, but it gives you the general idea.
Scatter Plot--A scatter plot is a good graph to use if you would like to see how data is following a particular trend.  There is a horizontal and vertical axis, and the data points are placed on it according to their frequency, and a line following the general direction of the points will lend information to its trend.

This scatter plot shows the relationship between the ages of husbands and wives, and tells us that the trend is positive that as men get older, so do their wives.  Something like that.
Histogram and Bar Graph--I included these together because they are similar, and their differences complement each other nicely.  In a histogram, the bars touch, the data has a relationship to each other, and they need to be in a particular order.  In a bar graph, the data is categorical, and since there's no relationship between the data, the bars do not touch.

Pie Chart--A pie chart is a good graph to illustrate the parts of a whole.

Dot Plot--A dot plot is a good visual representation of frequency in data.

Line Graph--A line graph is effective for showing changes over time.

Pictograph--A pictograph uses pictures to illustrate the data, and should have a legend attached to describe the frequency amounts.