# Class 10: Topic 9: Measures of Spread

This outline is also available in PDF.

Held: Wednesday, 13 February 2008

Summary: We consider another way to look at distributions of data: How spread out (or close together) are the data. Along the way, we consider three standard measures of spread: range, interquartile range (IQR), and standard deviation.

Notes:

• I've added a link to the data sets to the class web, so that those of you who want to try to work from home can more easily do so.
• I'll try to talk less today so that you have more time for lab.
• I mentioned the other day that color choice is important because some people are color blind in some ways. I'll note that his morning I re-verified my partial color blindness.
• Homework for Friday: Activities 9-14, 9-15, 9-20, 9-23.
• Preparation for Wednesday: Overview and Preliminaries for Topic 10.
• Preparation: Overview and Preliminaries 1-3 for Topic 9.
• Handouts: R notes on activity 9.
• Due: Activities 8-9, 8-17, 8-18, 8-22, 8-23.

Overview:

• Beyond centers and shape: Spread.

Disclaimer: I usually create these pages on the fly, which means that I rarely proofread them and they may contain bad grammar and incorrect details. It also means that I tend to update them regularly (see the history for more details). Feel free to contact me with any suggestions for changes.

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Samuel A. Rebelsky, rebelsky@grinnell.edu

Copyright © 2008 Samuel A. Rebelsky. This work is licensed under a Creative Commons Attribution-NonCommercial 2.5 License. To view a copy of this license, visit `http://creativecommons.org/licenses/by-nc/2.5/` or send a letter to Creative Commons, 543 Howard Street, 5th Floor, San Francisco, California, 94105, USA.