1. The Shape and Spread of Data
Box Plot: Identify Outliers and See Spread and Center
Box Plot Cannot Show the shape for this we go to histograms and stem and leaf plot.
The Shape and Spread
of Data

2. Describing Distribution
Skew
Center and where most of the data appears
Outliers
Range
Max and Min
Uniform, bimodal, unimodal

3. Skewness: measures the lopsidedness of a distribution
Perfect fair exam
Exam was too easy
Exam was too hard

4. Describing Distribution
Skew
Center and where most of the data appears
Outliers
Range
Max and Min
Uniform, bimodal, unimodal

5. Stem and Leaf Plot
Can have decimals by using the key

6. Split stem and leaf plot

7. Back to back stem & leaf plot
Can show two sets of data at once
You do not have to have the same number of data points on each side of the plot.
Key works for both

8. Back to back stem & leaf plot
Heart Rates for two groups:
Group 1: 115, 115, 117, 126, 127, 127, 128, ,128, 129, 129, 129, 129, 130, 134, 134, 136, 136, 140, 142, 144
Group 2: 125, 125, 126, 134, 136, 138, 138, 142, 143, 146, 146, 147, 148 , 148, 153, 155, 155, 157, 162, 164
Make a
Back to back stem & leaf plot

9. What is the data telling you?
Skew
Center and where most of the data appears
Outliers
Range
Max and Min
Uniform, bimodal, unimodal