Dear Calc team, the following wording is ambiguous and it may be wrong altogether:
> function description: > calculates the probability of a *sample* mean greater than the mean of > the given *sample*. [EMPHASIS ADDED] So, does it compute the probabilities based on 2 samples? I doubt it. I may go back to basics. Lets say we have a population (P) with a population mean Mu(P), and a sample X, with a sample mean mu(X). The statistical hypothesis are: H0: Mu(P) == mu(X) Ha: Mu(P) either '<' or '>' mu(X) [the one tailed version] Depending on the tail used, it will be '<' or '>'. The 2-tailed version is Mu(P) '!=' mu(X). I haven't followed the discussion recently, so I am unable to tell exactly what is computed. But I very much suspect that it compares mu(X) against a population mean Mu(P). Also, the phrase dose not specify what statistics is used. It might be obvious that the z-statistic is used, but I would rather specify it explicitly. There are a lot of different statistics out there. Sincerely, Leonard Mada -------- Original-Nachricht -------- > Datum: 25 Aug 2009 07:20:41 -0000 > Von: [email protected] > An: [email protected] > Betreff: [Issue 90759] ZTEST not same as Excel > To comment on the following update, log in, then open the issue: > http://www.openoffice.org/issues/show_bug.cgi?id=90759 > > > > > > ------- Additional comments from [email protected] Tue Aug 25 07:20:40 > +0000 2009 ------- > Our proposal for the function wizard:- > > function description: > calculates the probability of a sample mean greater than the mean of > the given sample. > > first parameter > The given sample, drawn from a normally distributed population > > second parameter > The known mean of the population > > third parameter > The known standard deviation of the population. If omitted, the standard > deviation of the given sample is used. > > > --------------------------------------------------------------------- > Please do not reply to this automatically generated notification from > Issue Tracker. Please log onto the website and enter your comments. > http://qa.openoffice.org/issue_handling/project_issues.html#notification -- Jetzt kostenlos herunterladen: Internet Explorer 8 und Mozilla Firefox 3 - sicherer, schneller und einfacher! http://portal.gmx.net/de/go/chbrowser --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
