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DiffProps: Are these two populations statistically different? |
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Written by Jim Rohrer
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Thursday, 12 February 2009 20:03 |
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Use this to know whether the results of your survey about two populations have a statistically significant difference between them.
Example Usage
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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:
Full Name
Email
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Features
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* 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
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* Analyzing results of a survey
Known Audiences
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* Market Researchers
* Survey Administrators
* Statisticians
* Operations Researchers
References
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CliffsNotes.com. Test for Comparing Two Proportions. 3 March 2009
<http://www.cliffsnotes.com/WileyCDA/CliffsReviewTopic/topicArticleId-25951,articleId-25942.html>
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
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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
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Paper Books
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Books: CliffsAP Statistics (Paperback)
http://www.amazon.com/CliffsAP-Statistics-David-Kay/dp/0764573136/ref=pd_bbs_sr_1?ie=UTF8&s=books&qid=1236111221&sr=8-1
Survey Resources
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Sterling Research Group
http://bit.ly/19jqus
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Last Updated ( Thursday, 23 April 2009 14:46 )
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