1. Module 6: Descriptive Statistics

2. 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

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

4. 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

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

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