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From Wikipedia
A bar chart or bar graph is a chart with rectangular bars with lengths proportional to the values that they represent. The bars can be plotted vertically or horizontally.
Bar charts are used for plotting discrete (or 'discontinuous') data i.e. data which has discrete values and is not continuous. Some examples of discontinuous data include 'shoe size' or 'eye colour', for which you would use a bar chart. In contrast, some examples of continuous data would be 'height' or 'weight'. A bar chart is very useful if you are trying to record certain information whether it is continuous or not continuous data.
From Yahoo Answers
Answers:There are many questions here that are important that YOU research yourself. However, I will give you one example of where a "double bar graph" could be used: How many students ( females and males ) are in each grade in your school? The horizontal axis could show each "grade". The vertical axis could show "numbers of students". The "bars" are doubled; one showing females, the other males. good luck
Answers:I would say yes, it is discrete data because with a population size you couldn't have like 1.4 of a person... therefore they must be whole, round numbers, which is discrete.
Answers:a bar graph represents data using one bar, a double bar graph represents data using 2 bars. Double bar graphs compare two things over a certain period of time, single bar graphs show change of one thing over a period of time.
Answers:Well, I'm almost completely confused as well after reading your question. From the sound of it though, you don't need a bar graph, you need a scatter plot: http://en.wikipedia.org/wiki/Scatter_plot What you do is have one axis be height (I would recommend the vertical axis for the sake of clarity) and the other be tumble height (whatever that is). Then you take a bunch of measurements both of the people's height and tumble height and plot them. If you take a sufficient number of measurements with a large enough group of people and plot them you will see if there is a trend or not. If you can see a curve emerge from the collection of dots then it might be worth doing a regression of some form to see how good the fit actually is. But I'm not sure how serious you are about this. Your teacher probably recommended the use of a camera because it will be hard to measure the height of someone in motion.
From Youtube