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# st: Re: binary proportions and sample size

 From "Martin Weiss" To Subject st: Re: binary proportions and sample size Date Wed, 25 Mar 2009 19:15:10 +0100

```<>
-help immed-, -sampsi- or -prtesti-?

HTH
Martin
_______________________
```
----- Original Message ----- From: <nicola.baldini2@unibo.it>
```To: <statalist@hsphsun2.harvard.edu>
Sent: Wednesday, March 25, 2009 7:05 PM
Subject: st: binary proportions and sample size

```
This is stupid question stemming from a practical problem. The problem sounds easy and familiar, but I don't have a statistical manual at hand and no idea about the keywords to refine a search for the solution on Statalist. I took a (let's say random) sample of 74 tools from a popolation of 900. I checked personally each of the 74 tools, and found that 4 of them have some problems (5,4%) and 70 are ok. Can I expect to find 49 (5,4% x 900) problems in the population (i.e. is the sample size big enough to say so) and can I attach a p-value to my expectations (i.e. which is the probability that the problem-rate in the sample and in the population are different - statistically significantly different)? (And, obviously, which Stata command will answer to my questions???)
```Many thanks in advance for your help,
Nicola

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```
```
*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/
```

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