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## Friday, November 11, 2011

Graphing Post

A Pictograph uses pictures to represent a quantity of data values in order to decrease the size of the graph. A key must be used to explain the pictures.
Advantages: Easy to read, Visually appealing ,Handles large data sets easily using keyed Pictures
Disadvantages: Hard to quantify partial pictures Icons must be of consistent size Best for only 2-6 categories Very simplistic

A Line graph displays data as a percentage of the whole. Each pie section should have a label and percentage. A total data number should be included.
Advantages: Visually appealing Shows percent of total for each category
Disadvantages: No exact numerical data Hard to compare 2 data sets "Other" category can be a problem Total unknown unless specified Best for 3 to 7 categories Use only with discrete data

A bar graph displays discrete data in separate columns. A double bar graph can be used to compare two data sets. Categories are considered unordered and can be rearranged alphabetically, by size, etc.
Advantages: Visually strong Can easily compare two or three data sets
Disadvantages: Graph categories Use only with discrete data can be reordered to emphasize certain effects

A Double bar graph are best for showing two sets of data across catorgies.
Advantages:double bar graph gives two or more pieces of information one graph
Disadvantges:. However, if a group vertical bar graph has too many series of data, the graph becomes cluttered and it can be confusing to read.

A Circle Graph displays data as a percentage of the whole. Each pie section should have a label and percentage. A total data number should be included.
Advantages:Visually appealing Shows percent of total for each category
Disadvantages:No exact numerical data Hard to compare 2 data sets "Other" category can be a problem Total unknown unless specified Best for 3 to 7 categories Use only with discrete data

How Graphs Can be Misleading?(three ways)

A pictograph can be misleading when it is not drawn carefully and accuratley

A bar graph can be misleading when there is a break in the y-axis which means that one of the intervols is worth more than the others making then un even.

A bar graph can be misleading when one of the bars is colored differently.

2. aThe following chart shows Pizza Sub Sales over a month. What 2 graphs would show the information accurately?
bar graph & line graph.

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

A line graph would show that every week the sales get better. Of course I continue to keep selling pizza subs.

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?
Pictograph and Line Graph.

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

Hoped you liked it <3