# ::Free Statistics and Forecasting Software::

v1.1.23-r7
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### :: Testing Variance - Confidence Intervals for Population Variance - Free Statistics Software (Calculator) ::

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 confidence intervals for the one-sided and two-sided hypothesis test about the population variance (for a given sample size, sample variance, and confidence interval).

 Send output to: Browser Blue - Charts White Browser Black/White CSV MS Excel MS Word Sample size Sample Variance Confidence interval

 Source code of R module par1<-as.numeric(par1) par2<-as.numeric(par2) par3<-as.numeric(par3) df <- par1 - 1 halfalpha <- (1 - par3) / 2 ub <- par2 * df / qchisq(halfalpha,df) ua <- par2 * df / qchisq(1-halfalpha,df) ua ub ur <- par2 * df / qchisq(1-par3,df) ur ul <- par2 * df / qchisq(par3,df) ul load(file="createtable") a<-table.start() a<-table.row.start(a) a<-table.element(a,hyperlink("http://www.xycoon.com/ht_variance.htm","Testing Variance - Confidence Intervals for Population Variance","learn more about Statistical Hypothesis Testing about the Variance"),3,TRUE) a<-table.row.end(a) a<-table.row.start(a) a<-table.element(a,"Sample size",header=TRUE) a<-table.element(a,par1,2) a<-table.row.end(a) a<-table.row.start(a) a<-table.element(a,"Sample variance",header=TRUE) a<-table.element(a,par2,2) a<-table.row.end(a) a<-table.row.start(a) a<-table.element(a,"Confidence interval",header=TRUE) a<-table.element(a,par3,2) a<-table.row.end(a) a<-table.row.start(a) a<-table.element(a,"Type of Interval",header=TRUE) a<-table.element(a,"Left tail",header=TRUE) a<-table.element(a,"Right tail",header=TRUE) a<-table.row.end(a) a<-table.row.start(a) a<-table.element(a,paste("Two-sided confidence interval at ",par3), header=TRUE) a<-table.element(a,ua) a<-table.element(a,ub) a<-table.row.end(a) a<-table.row.start(a) a<-table.element(a,paste("Left one-sided confidence interval at ",par3), header=TRUE) a<-table.element(a,ul) a<-table.element(a,"+inf") a<-table.row.end(a) a<-table.row.start(a) a<-table.element(a,paste("Right one-sided confidence interval at ",par3), header=TRUE) a<-table.element(a,"0") a<-table.element(a,ur) a<-table.row.end(a) a<-table.row.start(a) a<-table.element(a, hyperlink("http://www.xycoon.com/ht_variance.htm#ex4", "more information about confidence interval","example"),3,TRUE) a<-table.row.end(a) a<-table.end(a) table.save(a,file="mytable.tab")
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 Cite this software as: Wessa P., (2008), Testing Population Variance - Confidence Intervals (v1.0.2) in Free Statistics Software (v1.1.23-r7), Office for Research Development and Education, URL http://www.wessa.net/rwasp_hypothesisvariance4.wasp/ The R code is based on : Xycoon, Statistics - Econometrics - Forecasting, Office for Research Development and Education, http://www.xycoon.com/ht_variance.htm#ex3
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 To cite Wessa.net in publications use:Wessa, P. (2013), Free Statistics Software, Office for Research Development and Education, version 1.1.23-r7, URL http://www.wessa.net/ © All rights reserved. Academic license for non-commercial use only. The free use of the scientific content, services, and applications in this website is granted for non commercial use only. In any case, the source (url) should always be clearly displayed. Under no circumstances are you allowed to reproduce, copy or redistribute the design, layout, or any content of this website (for commercial use) including any materials contained herein without the express written permission. Information provided on this web site is provided "AS IS" without warranty of any kind, either express or implied, including, without limitation, warranties of merchantability, fitness for a particular purpose, and noninfringement. We use reasonable efforts to include accurate and timely information and periodically update the information, and software without notice. We make no warranties or representations as to the accuracy or completeness of such information (or software), and it assumes no liability or responsibility for errors or omissions in the content of this web site, or any software bugs in online applications. Your use of this web site is AT YOUR OWN RISK. Under no circumstances and under no legal theory shall we be liable to you or any other person for any direct, indirect, special, incidental, exemplary, or consequential damages arising from your access to, or use of, this web site. Software Version : 1.1.23-r7Algorithms & Software : Patrick Wessa, PhDServer : www.wessa.net