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Univariate Data

Univariate Data. Chapters 1-6. UNIVARIATE DATA Categorical Data Percentages Frequency Distribution, Contingency Table, Relative Frequency Bar Charts (Always for comparison, Pie Charts, Segmented Bar Charts. Quantitative Data Dot Plots, Stem Plots, Box Plots, Histograms,

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Univariate Data

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  1. Univariate Data Chapters 1-6

  2. UNIVARIATE DATA • Categorical Data • Percentages • Frequency Distribution, Contingency Table, • Relative Frequency Bar Charts (Always for comparison, • Pie Charts, Segmented Bar Charts. • Quantitative Data • Dot Plots, Stem Plots, Box Plots, Histograms, • Cumulative Frequency Histogram

  3. Another Graphical Display for Categorical Data is a Pie Chart

  4. Contingency Tables and Segmented Bar Charts Relative Frequency Table Frequency Table

  5. Quantitative Data Distribution: Center, Shape, Spread, Outliers Measures of Center: Mean, Median, Mode Measures of Spread: Range, IQR, Standard Deviation Mean goes with Standard Deviation, Median goes with IQR Use mean and standard deviation when distribution is unimodal and symmetric Outlier Rule = 1.5 x IQR Addition/Subtraction changes only measures of Center Multiplication/Division changes measures of Center and Spread

  6. From an Ogive be prepared to find the median and IQR

  7. Comparing Distributions

  8. Describing Shapes of Distributions • Remember! • If distribution is unimodal and symmetric, the mean end median will be approximately • the same • If the distribution is skewed right, the mean will be to the right of the median • If the distribution is skewed left, the mean will be to the left of the median • Skewed distributions tend to have more variation than symmetric distributions

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