Database-Marketing: Calculator for Computing the Confidence-Interval

Database-Marketing Calculator

Calculating the Confidence-Interval for a specific Response-Rate

Response Rate of Test-Group (i.e.: 5.5)
Sample-size (i.e.: 2000):
Confidence Level:	80% 85% 90% 95%
The confidence-interval for the response-rate is between:	to

System Message:

When you have analyzed the response-rate of your direct-mailing and you want to draw conclusions out of the result, then you need to calculate the confidence-interval for this particular samplesize of the mailshot because you have to consider the random variance that might have occured for this particular sample.

The confidence-interval finally allows you to draw conclusions like:

If the response-rate for the sample of 2000 mailings was 5.5, then with 95% you can be sure that the true response-rate lies somewhere between 4.5% and 6.5%.

Attention !
These calculators are provided as is (mainly to demonstrate the techniques and tools of Database-Marketing) and we do not accept any responsibility for incorrect results. Although we have designed each of them with all of our experience - if you rely on the results you do so at your own risk.

And a technical note:
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