::Free Statistics and Forecasting Software::

All rights reserved. The non-commercial (academic) use of this software is free of charge. The only thing that is asked in return is to cite this software when results are used in publications.

This free online software (calculator) computes the z-score and probability of occurence of a specified value against a user-defined normal distribution. This R module is used in Workshop 3 of the PY2224 statistics course at Aston University, UK.

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Source code of R module

par1 <- as.numeric(par1) #mean par2<- as.numeric(par2) # Standrad Deviation par3<-as.numeric(par3) # value to test z<-(par3-par1)/par2 load(file='createtable') a<-table.start() a<-table.row.start(a) a<-table.element(a,'Simple Z-test',6,TRUE) a<-table.row.end(a) a<-table.row.start(a) a<-table.element(a,hyperlink('http://www.xycoon.com/arithmetic_mean.htm','Mean','definition of Mean'),1,TRUE) a<-table.element(a,hyperlink('http://www.xycoon.com/unbiased1.htm','Standard Deviation','definition of Standard Deviation'),1,TRUE) a<-table.element(a,'Test value',1,TRUE) a<-table.element(a,'Z-Score',1,TRUE) a<-table.element(a,'p value',1,TRUE) a<-table.row.end(a) a<-table.row.start(a) a<-table.element(a,par1,1) a<-table.element(a,par2,1) a<-table.element(a,par3,1) a<-table.element(a,signif(z, digits=3),1) a<-table.element(a,signif(pnorm(z), digits=3),1) a<-table.end(a) table.save(a,file='mytable.tab')

Cite this software as:

Ian E. Holliday (2017), Z-Test (sample value against a specified Normal Distribution) (v1.0.4) in Free Statistics Software (v1.2.1), Office for Research Development and Education, URL https://www.wessa.net/Ian.Holliday/rwasp_Z-Test.wasp/

The R code is based on :

To cite Wessa.net in publications use:
Wessa, P. (2024), Free Statistics Software, Office for Research Development and Education,
version 1.2.1, URL https://www.wessa.net/

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Software Version : 1.2.1
Algorithms & Software : Patrick Wessa, PhD
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