The Art of Presenting Data: The Pie Chart or Circle Graph What is it? How to Draw it.

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Presentation transcript:

The Art of Presenting Data: The Pie Chart or Circle Graph What is it? How to Draw it

2 What is a Pie Chart? A pie chart or circle graph has sectors that visually display proportional parts of a total set of data that share a common variable

3 Pie Chart Characteristics 1.Help an audience understand distribution of data quickly and easily. 2.Help to see how a total is divided into segments and percentages 3.Most effective when the number of segments is 10 or fewer 4.Especially useful with categorical data

4 Data on Marital Status from the US Census Bureau

5 Categ Data  TI for Pie Charts Get the raw data. Do a survey or read the data from a published survey Go to STAT, EDIT. Clear L1, L2, and L3 Input the raw categorical data into L1 Hit 2 nd MODE, exiting to home screen. Go to 2 nd STAT. Use RIGHT ARROW key and highlight MATH. ARROW DOWN to #5:SUM. Hit ENTER

6 Categ Data  TI for Pie Charts SUM( will appear on your home screen. Type 2 nd 1 and hit ENTER. The sum of the raw data appears on your screen. Note it on paper Go to 2 nd STAT:EDIT. ARROWs to the top of L2. Highlight L2. Type 2 nd  1  total of the data. (L1  data total). Hit ENTER. All the relative decimals will appear in L2.

7 Categ Data  TI for Pie Charts Highlight L3. Type 2 nd 2 ● 100. Hit ENTER. This multiplies every decimal by 100 to get %ages for each pie sector. ARROWS to the top of L4. Highlight L4. Type 2 nd 2 ● 360 (L2 ●360). Hit ENTER. This gives the  ° you need to use with your protractor for each segment of the pie chart. Draw the pie chart using the data in STAT:EDIT

8 Answers for Totals, %ages, Angle Degrees

9 Pie Chart Example

10 Classwork & Homework Use the terms you’ve learned to create your own pie charts Answer some the ‘usual’ questions about the nature of this chart using the data and your powers of analysis.