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What is an example of a interval?
5, 10 , 15, 20
Can changes to the vertical scale or interval affect the look of a bar or line graph?
Yes, changing the vertical scale will affect how the graph looks. To see examples, go to one of the financial web sites on Google or Yahoo and pick a few stock charts. If you are looking at an intraday chart (activity that happened during one day), the price may vary a dollar or so, but may look to jump all over the place. This is because the scale may be set to start at $50 per share (minimum value of the vertical scale) up to $55 maximum. Change the scale from zero to $60 and you will see a graph that looks more like a smooth line (the changes won't look as dramatic or steep). Another way to change the scale is to use a logarithmic scale (where each step represents 10 times the previous step). This is useful in graphs that represent exponential growth or decay. On a standard scale, the graph could look like a sharp increase, then leveling off. On a logarithmic scale, the same data plotted may look more like a straight line.
How do you Choosing the most reasonable interval for the data?
choose 5, 10, 25, or 100 as the most reasonable interval for 201, 450, 550, 600, 799
What sets of data would best be shown as a bar graph?
Lets say how many people like the water slide than the wave pool. if 10 people like the wave pool and 30 people like the water slide then thats what you would put down on the bar graph.
How can changing the interval on a bar graph change the way it is interpreted?
Let's say you have 2 bars, one of which is 5 and one of which is 15 (units not important). If you have the interval at 1 unit, then both bars would be relatively large. If you set the interval at 10 units, however, the bars suddenly seem much smaller. It's not because they ARE smaller, but because the interval makes them appear as such. So if someone wanted to skew a statistic, such as "Number of deaths by cigarettes in 2009", they could set the interval at a high number to make it appear to be a smaller bar, which gives the impression that it's not that big of a deal. Conversely, if they wanted to skew a statistic the other way, such as "Units Produced in March", they could set the interval at a very low number which would make the bar appear very large, giving the effect of a large amount produced.
