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## Friday, November 11, 2011

### Oudorn's Graphing Post

Graph Post

Circle graph- Advantages of using a circle graph is that you can see at a glance the largest group attended and a disadvantage is that the circle graph takes to long because you have to change your data into percents.

Bar Graph- Advantages of using a bar graph is that it is best for comparing data across categories and a disadvantage is that it can be only used with discrete data.

Double Bar Graph- A advantage for double bar graph is that it can be used to compare 2 sets of data. And a disadvantage is that it can only compare a couple of data depending on the intervals and can be not accurate.

Line Graph- An advantage is that it compares data over time. A disadvantage is that it can be only used with continuous data.

Pictograph- An advantage for a pictograph is that it compares data that can be easily counted and represented using symbols. And a disadvantage is that when the symbols are cut, you can't tell how much of the symbol they have taken off.

2. How can graphs be misleading. Show 3 ways.

• putting a break on the y-axis

• changing the size of a bar (making a bar wider/putting more area inside a bar)

• distorting the size of the visual

3a) The following chart shows Pizza Sub Sales over a month. What 2 graphs would show the information accurately?
A line graph and a bar graph

3b. If you were selling Pizza Subs would you continue? How does your graph explain your answer.

Yes, I would continue because when I look at my graph, it shows me that I am selling more every week.

4. Below you see 2 different examples of graphs showing healthy choices sold at the canteen. If you had to convince Mrs Mota that we should continue selling healthy choices which graph would you choose?

I would choose the line graph because it looks like every month the canteen is selling more and more.

4a) Change each graph so that your information looks even MORE impressive. You may not change the data just the graphs.