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July 1st, 2009, 12:31 PM   #1
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z test, t test, or chi squared test

If I run an AB split test for a marketing campaign and get these results:
A sent: 100000
A success: 50000
A conversion rate: 50.0%
B sent: 101000
B Success: 50400
Conversion rate: 49.9%

Which test would be better to run in order to find out if the results are statistically significant? Also, what results did you get if you ran both or either?
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July 1st, 2009, 12:34 PM   #2
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Re: z test, t test, or chi squared test

Additional info:

I've used both of the following:

Excel spreadsheet from The Analytical Group (http://www.analyticalgroup.com/download/sigtest.xls) using two independent samples

AB Test Calculator: http://www.splittestcalculator.com/

Not sure if either is right/none are right/both are right (it appears that the analytical group uses z test while the calculator uses Yates' chi squared test)
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