Introduction to a variety of useful statistical ideas and techniques - Improving the User Experience through Practical Data Analytics - page 21

SIDEBAR: HOW TO DISPLAY CONFIDENCE INTERVALS ON A BAR CHART
IN EXCEL—cont'd
5. Repeat Step 2 for any other means you have. Close both windows and your error bars should be on
the graph.
6. Make sure you indicate on your inished chart the conidence level you've used. In this case, it's
the typical 95%:
You're done!
When you present your indings, these error bars will help your audience quickly comprehend how
accurate your means are, and as a consequence, how different they are.
1.3.3 FINDING A CONFIDENCE INTERVAL USING SPSS
When using SPSS (Statistical Package for Social Sciences), there is nothing to
activate! You simply open the software and you're ready to go. You type in the
data, or open a ile that already has the data in it, and ask for the conidence
interval. When you open up a blank SPSS page, what you see is depicted in
Figure 1.14 .
It looks a lot like a standard Excel page, but, instead of listing the columns
according to the alphabet, it simply numbers them as variables (“VAR”). If we