Different Proportions: Are these proportions statistically different?

by

Coming back to the app stores soon…

Use this to know whether the results of your survey about two populations have a statistically significant difference between them.

Example Usage
=============
A hotel operator routinely survey’s customers and wants to know whether the guests that arrive at night are less likely rate “Recommend” the hotel than her guests that arrive during the day shift.

+—————+—–+————————————+
| Population | n | # that would “Recommend” the hotel |
+—————+—–+————————————+
| Night Arrival | 100 | 67 |
+—————+—–+————————————+
| Day Arrival | 230 | 175 |
+—————+—–+————————————+

Answer: There is not a statistically significant difference at the 95% level (but there is at the 90% level)!

Ok, I’m curious. Update me when you launch this:
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Features
=========
* Engligh wording explaining the results
* Pretty arrows indicate which group has a statistically higher response rate, if any.
* Unique “Detailed Results” for the thurow checker.
* Detailed Results Show:
** Shows Actual Inputs to help verify calculations
** Show actual level of significance (say, 75%, instead of your desired 95%)
** Converted response rates to percentages
** z value
** Inverse Cumulative Distribution Function (aka: z from the normal table at the ‘95.00%’ significance level)
* Web Citations
* Suggested Book Links

Note: Requires Internet Access

Known Uses
==========
* Analyzing results of a survey

Known Audiences
================
* Market Researchers
* Survey Administrators
* Statisticians
* Operations Researchers

References
==========
CliffsNotes.com. Test for Comparing Two Proportions. 3 March 2009

StatTrek.com: AP* Statistics Tutorial: Hypothesis Test for Difference Between Proportions. 3 March 2009
http://stattrek.com/AP-Statistics-4/Test-Difference-Proportion.aspx?Tutorial=AP

Web Tools
======
Testing for Statistically Significant Differences Between Two Proportions
http://app.eleganttechnologies.com/php/app/eg/prod/html/BigDeal.php?StrTarget=Web&EnumSource=Iphone&SnAppleDevice=XXX&EnumOutputFormat=Web&EnumAction=Web

Polaris Marketing Basic Statistical Testing Calculator
http://www.polarismr.com/education/tools_stat_diff_prop.html

Kindle Books
============

Paper Books
============
Books: CliffsAP Statistics (Paperback)

Survey Resources
=================
Sterling Research Group
http://bit.ly/19jqus