Metadata

Downloads

Version History

Hypothesis Testing: Two Population Means and Two Population Proportions: Comparing Two Independent Population Means with Unknown Population Standard Deviations: Added populations are normal to the examples.  Included reference to the Aspin-Welch t-test. For Example 1, expanded the conclusion.

Hypothesis Testing: Two Population Means and Two Population Proportions: Comparing Two Independent Population Means with Unknown Population Standard Deviations: Adding spacing for clarity.

Hypothesis Testing: Two Population Means and Two Population Proportions: Comparing Two Independent Population Means with Unknown Population Standard Deviations: Updated graph.

Hypothesis Testing: Two Population Means and Two Population Proportions: Comparing Two Independent Population Means with Unknown Population Standard Deviations: Minor edits.

Hypothesis Testing: Two Population Means and Two Population Proportions: Comparing Two Independent Population Means with Unknown Population Standard Deviations: Updated glossary item "Variable (Random Variable)."

Hypothesis Testing: Two Population Means and Two Population Proportions: Comparing Two Independent Population Means with Unknown Population Standard Deviations:
Changed the second item below the title of the module to read "Both populations are normally distributed with the population means and standard
deviations unknown unless the sample sizes are greater than 30.  In that case, the populations need not be normally distributed."  Made minor edits to the glossary.

Two Population Means and Two Population Proportions: Comparing Two Independent Population Means with Unknown Population Standard Deviations:  Took out the two sentences about pooled variances that appear after the df formula and before the first NOTE. In the bulleted list below the T-score formula, corrected the list to have 3 bullets instead of 4.  In the NOTE that contains the calculator instructions, corrected .75 to read square root of .75.   

roles updated

See Change History (m17360) for a list of specific changes for this revision.

fixed solutions and metadata

removed image width params from media tags

table corrections

Post review edits

post review edits

post review updates

Reviewed for consistency

Made corrections to equations and exercises.

Initial publication

How to Reuse and Attribute This Content

If you derive a copy of this content using a Connexions account and publish your version, proper attribution of the original work will be automatically done for you.

If you reuse this work elsewhere, in order to comply with the attribution requirements of the license (CC-BY 3.0), you must include

See the citation section below for examples you can copy.

How to Cite and Attribute This Content

The following citation styles comply with the attribution requirements for the license (CC-BY 3.0) of this work:

American Chemical Society (ACS) Style Guide:

Dean, S.; Illowsky, B. Hypothesis Testing: Two Population Means and Two Population Proportions: Comparing Two Independent Population Means with Unknown Population Standard Deviations, Connexions Web site. http://cnx.org/content/m17025/1.18/, Jun 14, 2012.

American Medical Assocation (AMA) Manual of Style:

Dean S, Illowsky B. Hypothesis Testing: Two Population Means and Two Population Proportions: Comparing Two Independent Population Means with Unknown Population Standard Deviations [Connexions Web site]. June 14, 2012. Available at: http://cnx.org/content/m17025/1.18/.

American Psychological Assocation (APA) Publication Manual:

Dean, S., & Illowsky, B. (2012, June 14). Hypothesis Testing: Two Population Means and Two Population Proportions: Comparing Two Independent Population Means with Unknown Population Standard Deviations. Retrieved from the Connexions Web site: http://cnx.org/content/m17025/1.18/

Chicago Manual of Style (Bibliography):

Dean, Susan, and Barbara Illowsky. "Hypothesis Testing: Two Population Means and Two Population Proportions: Comparing Two Independent Population Means with Unknown Population Standard Deviations." Connexions. June 14, 2012. http://cnx.org/content/m17025/1.18/.

Chicago Manual of Style (Note):

Susan Dean and Barbara Illowsky, "Hypothesis Testing: Two Population Means and Two Population Proportions: Comparing Two Independent Population Means with Unknown Population Standard Deviations," Connexions, June 14, 2012, http://cnx.org/content/m17025/1.18/.

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

Dean, S., & Illowsky, B. 2012. Hypothesis Testing: Two Population Means and Two Population Proportions: Comparing Two Independent Population Means with Unknown Population Standard Deviations. Connexions, June 14, 2012. http://cnx.org/content/m17025/1.18/.

Modern Languages Association (MLA) Style Manual:

Dean, Susan, and Barbara Illowsky. Hypothesis Testing: Two Population Means and Two Population Proportions: Comparing Two Independent Population Means with Unknown Population Standard Deviations. Connexions. 14 June 2012 <http://cnx.org/content/m17025/1.18/>.