# Class 20: Topic 16: Confidence Intervals: Proportions

This outline is also available in PDF.

Held: Friday, 7 March 2008

Summary: In our recent explorations of sample statistics, we have assumed that we know the population parameters. Today, we begin to explore how we think about the accuracy of our statistics as estimates of unknown population parameters. We consider the particular case of proportions.

Notes:

• Class time reserved for any campus issues you wish to discuss.
• Homework collected.
• We'll use a different strategy today: We're going to do the activities as a class.
• Work for Monday: Activities 16-7, 16-9, 16-10, 16-19, 16-21. Also Overview and Preliminaries (as appropriate) for Topic 17.
• We'll cover Topic 17 over two days (Monday and Wednesday) next week.
• There is no class next Friday.
• Quiz!
• More serious quiz on Monday (on sampling distributiosn).

Overview:

• Samples vs. Populations, Revisited.
• Estimating Population Proportions from Sample Proportions.
• Exploring the Confidence of Our Estimates.

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.