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L2-ss

# L2-ss - The UNIVERSITY of NORTH CAROLINA at CHAPEL HILL...

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5/11/11 Lecture 2 1 STOR 155 Introductory Statistics Lecture 2: Displaying Distributions with Graphs: HG & Time Plots The UNIVERSITY of NORTH CAROLINA at CHAPEL HILL

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5/11/11 Lecture 2 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
5/11/11 Lecture 2 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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5/11/11 Lecture 2 4 Stem-and-leaf plot for pups 0|122333333333333344… ( 35 ) 0|555555555555555555555555. .. ( 132 ) 1| 001
5/11/11 Lecture 2 5 Histogram • Partition the range of values of a quantitative variable into intervals and display only the count or percent of the observations that fall into each interval.

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L2-ss - The UNIVERSITY of NORTH CAROLINA at CHAPEL HILL...

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