## Thursday, November 10, 2011

### Abby's Graphing Post

Bar Graphs - are best comparing data across categories
Advantage - you can easily compare it to different categories
Disadvantage - you cant really see the exact numbers in the bar graph

Double Bar Graphs - are best for comparing two sets of data across categories
Advantage - you can compare the two sets of data at the same time
Disadvantage - you could get confused by the two sets of data that are together even though they are black and white

Circle Graphs - are best for comparing categories to the whole using percents. The sum of the percents in a circle graph is 100%
Advantage - there good for comparing percentages in a whole
Disadvantage - you have to work to find the percent of the category

Line Graphs - are best for showing changes in data over time
Advantage - you could easily show the progress you have over time
Disadvantage - the exact amount isn't clear

Pictographs - are best for comparing data that can be easily counted and represented using symbols
w the exact number

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

- Distorting the size of the bars (making one larger than the other)

- Distortion in the scale (break down the y-axis)

- Distortion the bars in the graph (change one bar to a different color)

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

I would use a bar graph and a line graph to represent this information accurately.

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

I would continue to sell the Pizza Subs because it shows that when I look at both graphs its showing that the sales every week were increasing. That is the trend would be going up.

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?

If I would convince Mrs. Mota to continue selling healthy food choices I would use the line graph because it shows that the trend of the sales of healthy food items were increasing and or decreasing in the line graph.

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