Module 6: Descriptive Statistics

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Presentation transcript:

Module 6: Descriptive Statistics

Overview: Describing Data with Stats and Graphs Levels of measurement Measures of central tendency and variability When to use each Summarizing the data Visualizing your distribution Comparing groups

Levels (Scales) of Measurement Nominal Ordinal Interval Ratio Let’s practice When to use each

Measures of Central Tendency Raw data not workable Need a way to summarize what the most common sort of response is Mode Median Mean When to use each

Measures of Variability or Spread Why data description is not complete without them Range Semi-interquartile range Variance Sample and population forms Standard deviation

Summarizing your Data Graphically Visualizing your distribution Pie charts Bar charts Histograms Comparing groups Bar graphs Line graphs