1. Section 12.3 Box-and-Whisker Plots
Algebra Concepts
Section 12.3
Box-and-Whisker Plots

2. Box-and-Whisker Plot- displays the distribution of data items along a number line.

3. Quartiles-divide the data into four equal parts.
The median is the middle quartile

4. Lower quartile is the median of the “lower” half of the data
Upper quartile is the median of the “upper” half of the date
The box is drawn from the lower quartile to the upper quartile
The whiskers go from the ends of the box to the high and low value of the data

5. Make a box and whisker plot
Age when students first had their own cell phone
Arrange data from low to high
Find the quartiles
Make graph

6. Analyzing the graph It shows the high and low value
If the box is small, most of the data is close to the median
If the whiskers are long the extreme values are far from the median