## Knowledge Base » SigmaXL Toolbox

Comparing ANOVA and Boxplot Results

on January 01, 2012

*How can I compare ANOVA and Boxplot results?*

**Comparing ANOVA and Boxplot Results**

The following graph of *Overall Satisfaction* by *Customer
Type* is created using **One-Way ANOVA**.

(Recreate this example using **Customer Data.xls**, included
with SigmaXL as Sample Data):

Now
create a **Boxplot** using the same data:

It
may be confusing to see that the "vertical line" for each location in
the **ANOVA** chart does not seem to represent the
total spread of the data versus the **Boxplot**,
which shows the minimum and maximum.

The graph in **ANOVA** shows the mean and 95% confidence
intervals (with a pooled estimate of StDev), hence the vertical lines will be different
from the **Boxplot**.

If you use the **Multi-Vari** chart in **Graphical Tools**, (**SigmaXL
> Graphical Tools > Multi-Vari**) the vertical lines will be the same
as those in the **Boxplot**,
except when there is an outlier.

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