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# About: Confidence Intervals: Practice 1

Module by: Susan Dean, Barbara Illowsky, Ph.D.. E-mail the authors

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 Name: Confidence Intervals: Practice 1 ID: m16970 Language: English (en) Subject: Mathematics and Statistics Keywords: elementary, statistics License: Creative Commons Attribution License CC-BY 3.0 Authors: Copyright Holders: Maintainers: Latest version: 1.13 (history) First publication date: Jun 6, 2008 4:40 pm -0500 Last revision to module: Jun 6, 2012 7:01 am -0500

 PDF: m16970_1.13.pdf PDF file, for viewing content offline and printing. Learn more. XML: m16970_1.13.cnxml XML that defines the structure and contents of the module, minus any included media files. Can be reimported in the editing interface. Learn more.

## Version History

 Version: 1.13 Jun 6, 2012 7:01 am -0500 by Changes: `Confidence Intervals: Practice 1: Changed "average" to "mean" where needed.` Version: 1.12 Jun 5, 2012 9:51 pm -0500 by Changes: `Confidence Intervals: Practice 1: Updated problem.` Version: 1.11 Mar 20, 2009 10:15 am -0500 by Changes: ` Confidence Intervals: Practice 1: Added to the definition of Xbar "25 randomly selected."` Version: 1.10 Mar 19, 2009 8:50 pm -0500 by Changes: `Confidence Intervals: Practice 1: Added the word average to the definition of Xbar. ` Version: 1.9 Feb 18, 2009 8:07 pm -0600 by Changes: `Upconverted and added appropriate class attribute.` Version: 1.8 Jan 26, 2009 3:36 pm -0600 by Changes: `Confidence Intervals: Practice 1: Changed the Student Learning Outcome to read: "The student will explore the properties of Confidence Intervals for Averages when the population standard deviation is known."` Version: 1.7 Oct 27, 2008 11:58 am -0500 by Changes: `roles updated` Version: 1.6 Aug 15, 2008 3:45 pm -0500 by Changes: `uploaded handouts` Version: 1.5 Jul 21, 2008 2:57 am -0500 by Changes: `removed draft note` Version: 1.4 Jul 14, 2008 4:01 pm -0500 by Changes: `edited image width params and removed them` Version: 1.3 Jul 9, 2008 6:05 am -0500 by Changes: `Post review updates` Version: 1.2 Jul 7, 2008 2:48 pm -0500 by Changes: `post review updates` Version: 1.1 Jun 26, 2008 1:43 pm -0500 by Changes: `Initial publication`

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## How to Cite and Attribute This Content

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### American Chemical Society (ACS) Style Guide:

Dean, S.; Illowsky, B. Confidence Intervals: Practice 1, OpenStax-CNX Web site. http://cnx.org/content/m16970/1.13/, Jun 6, 2012.

### American Medical Assocation (AMA) Manual of Style:

Dean S, Illowsky B. Confidence Intervals: Practice 1 [OpenStax-CNX Web site]. June 6, 2012. Available at: http://cnx.org/content/m16970/1.13/.

### American Psychological Assocation (APA) Publication Manual:

Dean, S., & Illowsky, B. (2012, June 6). Confidence Intervals: Practice 1. Retrieved from the OpenStax-CNX Web site: http://cnx.org/content/m16970/1.13/

### Chicago Manual of Style (Bibliography):

Dean, Susan, and Barbara Illowsky. "Confidence Intervals: Practice 1." OpenStax-CNX. June 6, 2012. http://cnx.org/content/m16970/1.13/.

### Chicago Manual of Style (Note):

Susan Dean and Barbara Illowsky, "Confidence Intervals: Practice 1," OpenStax-CNX, June 6, 2012, http://cnx.org/content/m16970/1.13/.

### Chicago Manual of Style (Reference, in Author-Date style):

Dean, S., & Illowsky, B. 2012. Confidence Intervals: Practice 1. OpenStax-CNX, June 6, 2012. http://cnx.org/content/m16970/1.13/.

### Modern Languages Association (MLA) Style Manual:

Dean, Susan, and Barbara Illowsky. Confidence Intervals: Practice 1. OpenStax-CNX. 6 June 2012 <http://cnx.org/content/m16970/1.13/>.