Lecture 2 notes

# Lecture 2 notes - Chapter 2 DESCRIBING AND ORGANIZING DATA...

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Chapter 2: DESCRIBING AND ORGANIZING DATA 2.1 DESCRIPTIVE METHODS FOR ONE SAMPLE 1. Dotplots – for small data sets (Devore 7e page 12) (MINITAB: Graph Dotplot...) 2. Histograms – large data sets (Devore 7e pages 13–20) (MINITAB: Graph Histogram...) First form frequency table – binning General principles: 7-15 equal width non-overlapping intervals Frequencies or relative frequencies Frequencies or cumulative frequencies Look for features and patterns (Devore 7e page 19) Unimodal or multimodal?
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Unformatted text preview: Center? Spread? Outliers, gaps? 3. Stemplots – for medium data sets (Devore 7e pages 10–12) (MINITAB: Graph ⇒ Stem-and-Leaf. .. or Stat ⇒ EDA ⇒ Stem-and-Leaf. .. ) Truncation Splitting stems e.g. into 2 or 5 parts Depths 4. Boxplots (Devore 7e pages 35–39) (MINITAB: Graph ⇒ Boxplot. ..) Median, quartiles (fourths), inter-quartile range (IQR) (fouth spread) (Devore 7e page 35–36). The “ﬁve number summary” (page 35). 1...
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• Spring '05
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• Interquartile range, DeVore, data sets, non-overlapping intervals Frequencies

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