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Circle Graphs

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Circle Graphs

  1. 1. Unit 2 – Data Analysis & Interpretation Consumer Mathematics 30S Using Circle Graphs to Represent Data
  2. 2. Circle Graphs Another way to display data is in the form of a circle graph or pie chart. Circle graphs are useful in displaying percentages, or parts of a whole. Unit 2 – Data Analysis & Interpretation Consumer Mathematics 30S
  3. 3. Circle Graphs Unit 2 – Data Analysis & Interpretation Consumer Mathematics 30S Properties of Circle Graphs: • They are circular shaped graphs with the entire circle representing the whole. • The circle is then split into parts, or sectors. • Each sector represents a part of the whole. • Each sector is proportional in size to the amount each sector represents, therefore it is easy to make generalizations and comparisons.
  4. 4. Constructing Circle Graphs Unit 2 – Data Analysis & Interpretation Consumer Mathematics 30S When constructing a circle graph, follow the steps below 1. Is the Data Suitable--Determine if there is a "whole" for the data. Then determine what the different parts, or data groups, of the whole are. 2. Calculate Percentages--For data that is not already given as a percentage, convert the amounts for each part, or data group size, into a percentage of the whole. 3. Draw the Graph--Draw a circle and draw in a sector for each data group. 4. Title and Label the Graph--Label the sectors with the data group name and percentage. Then add a title to the graph. This is the same as the title of the table.
  5. 5. Example Unit 2 – Data Analysis & Interpretation Consumer Mathematics 30S Construct a circle graph for the following data.
  6. 6. Constructing a Circle Graph Unit 2 – Data Analysis & Interpretation Consumer Mathematics 30S Step 1 – Is the Data Suitable? • There are five parts to the whole. Each data group is a category of sneaker brands (1) Adidas, (2) Nike, (3) Reebok, (4) Asics, (5) Other. Step 2 – Calculate Percentages • Calculate the whole: 150 + 192 + 60 + 108 + 90 = 600 • Calculate the percentage for each part ex. Adidas: 150/600 = .25 or 25%
  7. 7. Constructing a Circle Graph Unit 2 – Data Analysis & Interpretation Consumer Mathematics 30S Step 3 – Draw the Graph • First, draw a circle. Then, draw in the sectors of the circle using a protractor to calculate the size of the sector. • The percentage has to be converted to a degrees. ex. 25% or .25 x 360o = 90o Step 4 – Title and Label the Graph
  8. 8. Can circle graphs be misleading? Unit 2 – Data Analysis & Interpretation Consumer Mathematics 30S Classroom Activity: Page 118 - 119
  9. 9. Unit 2 – Data Analysis & Interpretation Consumer Mathematics 30S Textbook Assignment: Page 120 - 121 Questions 1 - 2
  10. 10. Unit 2 – Data Analysis & Interpretation Consumer Mathematics 30S Textbook Assignment: Page 120 - 121 Questions 1 - 2

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