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Categorical and Measurement Data
(Qualitative and Quantitative Data)
Categorical Data (Qualitative) — Categorical data identifies a class or category for an object or an observation based on
some qualitative trait. (e.g. , gender, male and female, rankings like good or bad)
Measurement Data (Quantitative) — Measurement data has a numerical value based on quantitative data that could be
placed on a number line.
How can you DISPLAY the different types of data?
Categorical
Measurement
Pie Graphs
Histograms
Bar Graphs
Stem-and-Leaf Plots
Picture Graphs
Dot Plots
Line Plots
Box-and-Whisker Plots
Scatter Plots (two variables)
How can you analyze the different types of data?
Categorical
Measurement
Counts
Measures of Center — mean, median, mode, mid range
Percents
Measures of Spread — range, standard deviation,
interquartile range
Prediction (sometimes)
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