©evergreen public schools 2010 1 12/3/2010 compare boxplots
TRANSCRIPT
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©Evergreen Public Schools 2010
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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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What is an outlier?What is an outlier?
• 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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What is an outlier?What is an outlier?
• Read about the “Inner Quartile Range” from the book The Cartoon Guide to Statistics by Gonick and Smith.
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What is an outlier?What is an outlier?
• Use patty paper to trace the inner quartile range, or IQR.
• Draw 1.5 times the IQR.
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What is an outlier?What is an outlier?
• 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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What is an outlier?What is an outlier?
• 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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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