Add missing "z-test" function from Data Analysis Toolkit.
note that in libreoffice 4.3 Z.TEST() function has been added ( see https://wiki.documentfoundation.org/ReleaseNotes/4.3#Calc also see https://bugs.libreoffice.org/show_bug.cgi?id=72197 ) HENCE, Now this RFE to implement z-test can be easily be added in Data Analysis Toolpak. Kindly take it up for libreoffice 4.3 release.
Tomaž Vajngerl committed a patch related to this issue. It has been pushed to "master": http://cgit.freedesktop.org/libreoffice/core/commit/?id=475c2a083965cf358414f9ddb7d8e191f547a9d9 fdo#74669 Add z-test Statistics Dialog It will be available in 4.4.0. The patch should be included in the daily builds available at http://dev-builds.libreoffice.org/daily/ in the next 24-48 hours. More information about daily builds can be found at: http://wiki.documentfoundation.org/Testing_Daily_Builds Affected users are encouraged to test the fix and report feedback.