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Understanding and Comparing Distributions Ch. 5. HR Kings Hank Aaron 134538 274447 262434 443240 304420 39 12 402910 3444 Barry Bonds 163746 253345 244245.

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Presentation on theme: "Understanding and Comparing Distributions Ch. 5. HR Kings Hank Aaron 134538 274447 262434 443240 304420 39 12 402910 3444 Barry Bonds 163746 253345 244245."— Presentation transcript:

1 Understanding and Comparing Distributions Ch. 5

2 HR Kings Hank Aaron Barry Bonds

3 Stem and Leaf Diagram An effective way to display quantitative data when the data set is not too large Stem – the beginning digit(s) of the data value Leaf – the final digit(s) of the data value

4 Stem and Leafs When to use: Number of variables: 1 Data type: quantitative data Purpose: displaying data distribution Include a key

5 Stem and Leaf StemLeaf |3 represents 73 HRs Barry Bonds HRs

6 Stem and Leafs When to use: Number of variables: 2 Data type: quantitative data Purpose: compare two data distribution Label the groups

7 HR Kings Hank AaronBarry Bonds |3 represents 73 HRs

8 Box Plot Uses the five number summary to show the distribution of a data set Good for identifying outliers Don’t use on large data sets

9 Barry Bonds Five Number Summary Min Q1 Median Q3 Max 5 HRs 25 HRs 34 HRs 45 HRs 73 HRs

10 Outliers A data value is a potential outlier if the data value is – greater than Q * IQR or – less than Q1 – 1.5*IQR

11 What to look for when comparing When you describe a distribution always describe the Shape Center Spread


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