Lecture 3

# Lecture 3 - The UNIVERSITY of NORTH CAROLINA at CHAPEL HILL...

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1/17/08 Lecture 3 1 STOR 155 Introductory Statistics Lecture 3: Displaying Distributions with Graphs The UNIVERSITY of NORTH CAROLINA at CHAPEL HILL

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1/17/08 Lecture 3 2 Recall Data: Individuals Variables Categorical variables Quantitative variables Distribution of variables Graphical tools for categorical data Bar graph Pie chart Graphical tools for quantitative data Stemplot Any questions about homework?
1/17/08 Lecture 3 3 Example: A study on litter size Data: (170 observations) 4 6 5 6 7 3 6 4 4 6 4 4 9 5 10 6 6 5 6 8 2 7 7 7 9 3 7 5 7 7 4 5 5 6 7 6 7 8 6 6 7 6 6 7 5 4 5 6 6 1 3 4 7 5 4 7 5 8 8 5 6 8 5 5 4 9 6 7 3 7 7 5 4 6 9 6 7 7 5 7 3 7 6 5 3 7 10 5 6 8 7 5 5 7 5 5 8 9 7 5 7 5 5 5 6 3 7 8 7 7 6 3 4 4 4 7 2 7 8 5 8 6 6 5 6 4 7 5 5 6 9 3 5 4 8 3 9 8 3 6 5 4 7 8 4 8 6 8 5 6 4 3 8 8 6 9 5 5 6 6 7 6 8 6 11 6 5 6 6 3

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1/17/08 Lecture 3 4 Stemplot for pups 0|122333333333333344… ( 35 ) 0|555555555555555555555555. .. ( 132 ) 1| 001
1/17/08 Lecture 3 5 Histogram break the range of the values of a quantitative variable into intervals display only the count or percent of the observations that fall into each interval. You can choose any convenient number of intervals. Intervals must be of equal width.

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1/17/08 Lecture 3 6 Example: A study on litter size
1/17/08 Lecture 3 7 Exploratory data analysis in action: don’t hang up on me!!!

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1/17/08 Lecture 3 8 Exploratory data analysis in action: don’t hang up on me!!!
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Lecture 3 - The UNIVERSITY of NORTH CAROLINA at CHAPEL HILL...

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