©Evergreen Public Schools 2010 1 12/3/2010 Compare Boxplots.

©Evergreen Public Schools 2010

112/3/2010

Compare Boxplots


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• I can use appropriate summary statistics to compare and describe sets of data and write a conclusion from the data.

What can you compare two sets of data?


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LaunchLaunchLaunchLaunch• How many characters messages were

in the last message you sent?• We ask students in Mr. Sauter’s 3rd

period class this question.• We also asked teachers this question.• What is a question we might ask that

can be answered by looking at a graph of both sets of data?


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What is an outlier?What is an outlier?

• What do you think?

• An outlier is an observation that lies outside the overall pattern of a distribution (Moore and McCabe 1999).


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• Do there appear to be any outliers in Mr. Sauter’s class?

• If so, how many are there? What are the outliers?


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• Read about the “Inner Quartile Range” from the book The Cartoon Guide to Statistics by Gonick and Smith.


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• Use patty paper to trace the inner quartile range, or IQR.

• Draw 1.5 times the IQR.


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• Use the method described in the excerpt you read to determine if there are any outliers in Mr. Sauter’s class.

• If so, how many are there? What are the outliers?

• You can also use the histogram if it helps you.


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• Were you right?

A boxplot that shows outliers is called a modified boxplot.


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Students and TeachersStudents and Teachers

• What is a question we might ask that can be answered by looking at a graph of both sets of data?


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Students and TeachersStudents and Teachers

• Answer your question.• What else does the graph tell you?


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Team PracticeTeam Practice• What does the graph tell you?• How does this compare to the

histograms?


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DebriefDebrief

• What can you look for when you compare two boxplots?


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5

3

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Did you hit the target? I can use appropriate

summary statistics to compare and describe sets of data and write a conclusion from the data.

Rate your understanding of the target from 1 to 5.


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PracticePractice

• Practice 9.6A Compare Boxplots

©Evergreen Public Schools 2010 1 12/3/2010 Compare Boxplots.

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