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Circle GraphsBy: Alli Newman, Izzy Mouradian,And Emily Reger

Definition: A circle graph, also known as a pie chart, is a visual that helps to represent a whole relationship. Each sector represents a part of the whole and also adds up to 100%. Each sector is proportional in size to the amount each it represents of the whole circle. A circle graph is a good visual that makes it easier to make comparisons between the different data collected.

441.5%

449.9%

8.6%

Example From Outside Source:

Data: The data that must have been collected to make the graph was the amount of electoral votes per candidate in 1996. As you can see, Clinton and Dole were very close, but Perot’s percentage of 8.6% brought Dole’s down to a 41.5% and allowed Clinton to take the lead with 49.9%.

HourVarious Times Students Go To Bed

8 - 8:59 PM 19 - 9:59 PM 310 - 10:59 PM 611 - 11:59 PM 512 - 12:59 AM 1Beyond 12:59 AM 4

Hour Various Times Students Go To Bed On Weeknights

8 – 8:59 PM 1

9 – 9:59 PM 3

10 – 10:59 PM 6

11 – 11:59 PM 5

12 – 12:59 AM 1

Beyond 12:59 AM 4

Data Collection: Mrs. Ellwood’s 7th Period Class on 2/12/13

How to Create a Circle Graph

1. Open up excel2. Create a table (like the one from two previous slides) with

your data and the proper titles3. Highlight the data entered4. Choose a circle graph from the chart options5. You will get a graph similar to this6. Find your percents by dividing the given amount

by the total amount7. Insert a textbox onto the first sector and

type in the percent for that specific sector8. Repeat step 6 for the rest of the sectorsIn order to create a graph by hand when giventhe percentages, you must multiple the percentby 360. (ex: 60%= 0.6*360)

Various Times Students Go To

Bed

8 - 8:59 PM9 - 9:59 PM10 - 10:59 PM11 - 11:59 PM12 - 12:59 AMBeyond 12:59 AM

PROBLEM:Solve the following problem:

If the whole grade consisted of 450 people, what would be an accurate guess for the amount of students going to bed at 11 – 11:59 PM?

Advantages:Pie charts allow people to view the data collected not only as numbers, but also as different sized amounts by using the visual multicolored sectors.

Pie charts also let the creator communicate the data as percentages which the audience uses to see the amount as a whole compared to other portions. Also, you can see how close two amounts are to each other.

Disadvantages:The data cannot be compared at a level that is exact; the sector sizes can often be confused, and comparisons can be off.

Two or more different sets of data cannot be compared using pie charts. If you need to compare more than one set of data, you have to use a different type of graph.

Works CitedPictures:

•http://www.abc.net.au/tv/wildwatch/archive/image/pie_catdog.gif•http://intermath.coe.uga.edu/dictnary/images/stats/prescirc.gif •http://www.seriouseats.com/images/20080915-piechart.jpg •Clip Art

Websites:•"Pie Chart." Math Is Fun. Math Is Fun, n.d. Web. 11 Feb. 2013. <http://www.mathsisfun.com/data/pie-charts.html>.•Sam, Alexander. "Advantages & Disadvantages of a Pie Chart." eHow. Demand Media, n.d. Web. 13 Feb. 2013. <http://www.ehow.com/list_6715678_advantages-disadvantages-pie-chart.html>.