## Thursday, November 10, 2011

### Melina's Graphing Post

Bar graphs are best for comparing data across categories.
Can see it more clearer.
Can an easily compare two or three data sets.
Graph categories can be reordered to emphasize certain effects.
It uses only with individual data.

Double bar graphs are best for comparing two sets of data across categories.
Comparison is made easy and it will save time of the user to make quick comparison of large data.
You can record comparison between two things or objects.
you could get confused by both of the bars together even if they are in color or black and white.

Circle graphs are the best for comparing categories to the whole using percents. The sum of the percents in a circle graph is 100%
They are good for showing percentages of the whole.
You can't have more than 7 categories.
Line graphs are best for showing changes in data overtime
Can compare multiple continuous data sets easily
Interim data can be inferred from graph line
Use only with continuous data

Pictographs are best for comparing data that can be easily counted and represented using symbols.
Hard to quantify partial icons
Icons must be of consistent size
Best for only 2-6 categories

2. How can graphs be misleading. Show 3 ways

Color a bar different

Make the bar two times the original size

Make a break in the yaxis

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

The two graphs that would show the information accurately would be the line graph and the bar graph.

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

If i were selling pizza subs i would continue because my graph shows that i am selling more pizza subs than the week before so there might be a chance that i would sell more the week after.

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 that we are selling more healthy food choices each month.

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