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From |
"Martin Weiss" <martin.weiss1@gmx.de> |

To |
<statalist@hsphsun2.harvard.edu> |

Subject |
st: Re: binary proportions and sample size |

Date |
Wed, 25 Mar 2009 19:15:10 +0100 |

<> -help immed-, -sampsi- or -prtesti-? HTH Martin _______________________

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 problemsounds easy and familiar, but I don't have a statistical manual at handand no idea about the keywords to refine a search for the solution onStatalist.I took a (let's say random) sample of 74 tools from a popolation of 900. Ichecked personally each of the 74 tools, and found that 4 of them havesome 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 theprobability that the problem-rate in the sample and in the population aredifferent - statistically significantly different)? (And, obviously, whichStata command will answer to my questions???)Many thanks in advance for your help, Nicola * * 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/

* * 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/

**References**:**st: binary proportions and sample size***From:*nicola.baldini2@unibo.it

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