## Thursday, November 10, 2011

### Sarissa's Graphing Post

1. Use your notes to list the different types of graphs. Please list the advantages and disadvantages of each graph

Data can be presented using bar graphs, double bar graphs. circle graphs, line graphs, and pictographs.

The advantage of using a bar graph is that it compares data across categories and you can clearly see the comparison from each category . One disadvantage of using a bar graph is that some of the numbers can be hard to identify.

One advantage of using a double bar graph is that you can compare two sets of data on one graph. A disadvantage is that is can only be used when you compare two sets of data.

An advantage of using a circle graph is that it shows the percents of each category. One disadvantage is that it is harder to make and you have to find the percent of each number.

One advantage of using a line graph is that it shows data comparing over time, a disadvantage is that it could be hard to identify the exact number on the graph.

An advantage of using a pictograph is that the data is represented by symbols a disadvantage is that it can be harder to see if a symbol is cut in half.

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

In a pictograph, if you make the pictures look bigger on one of the objects, it would look more important compared to the other ones.

If you make one of the bars on a bar graph wider, 3D or colour it in, it can appear as the most important one.

If there is a break in the y-axis , it can make the data appear bigger or smaller then it really is.

2a) The following chart shows Pizza Sub Sales over a month. What 2 graphs would show the information accurately?

I think a bar or line graph would be best to represent the information most accurately.

2b) If you were selling Pizza Subs would you continue? How does your graph explain your answer.

Yes, I would continue selling pizza subs because the graph shows the pizza subs getting greater.

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 shows the data going up over time.

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