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Description of Statistical Computation

Author's title

Author*The author of this computation has been verified*
R Software Modulerwasp_hypothesisvariance4.wasp
Title produced by softwareTesting Variance - Confidence Intervals for Population Variance
Date of computationSun, 09 Nov 2008 06:28:57 -0700
Cite this page as followsStatistical Computations at FreeStatistics.org, Office for Research Development and Education, URL https://freestatistics.org/blog/index.php?v=date/2008/Nov/09/t1226237360rdhlpf6x7tqmnpt.htm/, Retrieved Sun, 19 May 2024 08:46:46 +0000
Statistical Computations at FreeStatistics.org, Office for Research Development and Education, URL https://freestatistics.org/blog/index.php?pk=22746, Retrieved Sun, 19 May 2024 08:46:46 +0000
QR Codes:

Original text written by user:
IsPrivate?No (this computation is public)
User-defined keywords
Estimated Impact153

Tree of Dependent Computations

Family? (F = Feedback message, R = changed R code, M = changed R Module, P = changed Parameters, D = changed Data)
F     [Testing Variance - Critical Value (Region)] [vraag 1] [2008-11-09 12:52:15] [c45c87b96bbf32ffc2144fc37d767b2e]
F RMP     [Testing Variance - Confidence Intervals for Population Variance] [vraag 4] [2008-11-09 13:28:57] [3dc594a6c62226e1e98766c4d385bfaa] [Current]
- RMP       [Testing Variance - Confidence Intervals for Sample Variance] [] [2008-11-09 13:31:07] [c45c87b96bbf32ffc2144fc37d767b2e]
Feedback Forum
2008-11-19 15:43:57 [] [reply] 
De student heeft deze vraag correct beantwoord en de juiste methode toegepast. Er is sprake van een scheve verdeling. De rechter staart is meer uitgerokken dan de linker.
2008-11-19 15:59:36 [Nathalie Koulouris] [reply] 
De student heeft deze vraag correct beantwoord en de juiste methode toegepast. Er is sprake van een scheve verdeling. De rechter staart is meer uitgerokken dan de linker.
2008-11-19 21:02:41 [Michaël De Kuyer] [reply] 
In bepaalde mate heb ik deze vraag correct beantwoord. Ik had ook nog kunnen vermelden in welke mate er geen normaalverdeling is. Het is namelijk zo dat er een scheve verdeling is waarvan de rechterstaart uitgerekter is.

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Dataset

Tables (Output of Computation)





Summary of computational transaction
Raw Inputview raw input (R code)
Raw Outputview raw output of R engine
Computing time2 seconds
R Server'Herman Ole Andreas Wold' @ 193.190.124.10:1001

\begin{tabular}{lllllllll}
\hline
Summary of computational transaction \tabularnewline
Raw Input & view raw input (R code)  \tabularnewline
Raw Output & view raw output of R engine  \tabularnewline
Computing time & 2 seconds \tabularnewline
R Server & 'Herman Ole Andreas Wold' @ 193.190.124.10:1001 \tabularnewline
\hline
\end{tabular}
%Source: https://freestatistics.org/blog/index.php?pk=22746&T=0

[TABLE]
[ROW][C]Summary of computational transaction[/C][/ROW]
[ROW][C]Raw Input[/C][C]view raw input (R code) [/C][/ROW]
[ROW][C]Raw Output[/C][C]view raw output of R engine [/C][/ROW]
[ROW][C]Computing time[/C][C]2 seconds[/C][/ROW]
[ROW][C]R Server[/C][C]'Herman Ole Andreas Wold' @ 193.190.124.10:1001[/C][/ROW]
[/TABLE]
Source: https://freestatistics.org/blog/index.php?pk=22746&T=0

Globally Unique Identifier (entire table): ba.freestatistics.org/blog/index.php?pk=22746&T=0

As an alternative you can also use a QR Code:  
QR Code


The GUIDs for individual cells are displayed in the table below:

Summary of computational transaction
Raw Inputview raw input (R code)
Raw Outputview raw output of R engine
Computing time2 seconds
R Server'Herman Ole Andreas Wold' @ 193.190.124.10:1001






Testing Variance - Confidence Intervals for Population Variance
Sample size320
Sample variance4.2
Confidence interval0.95
Type of IntervalLeft tailRight tail
Two-sided confidence interval at 0.953.617440959935944.93635971376001
Left one-sided confidence interval at 0.953.70466242131918+inf
Right one-sided confidence interval at 0.9504.80868448592078
more information about confidence interval

\begin{tabular}{lllllllll}
\hline
Testing Variance - Confidence Intervals for Population Variance \tabularnewline
Sample size & 320 \tabularnewline
Sample variance & 4.2 \tabularnewline
Confidence interval & 0.95 \tabularnewline
Type of Interval & Left tail & Right tail \tabularnewline
Two-sided confidence interval at  0.95 & 3.61744095993594 & 4.93635971376001 \tabularnewline
Left one-sided confidence interval at  0.95 & 3.70466242131918 & +inf \tabularnewline
Right one-sided confidence interval at  0.95 & 0 & 4.80868448592078 \tabularnewline
more information about confidence interval \tabularnewline
\hline
\end{tabular}
%Source: https://freestatistics.org/blog/index.php?pk=22746&T=1

[TABLE]
[ROW][C]Testing Variance - Confidence Intervals for Population Variance[/C][/ROW]
[ROW][C]Sample size[/C][C]320[/C][/ROW]
[ROW][C]Sample variance[/C][C]4.2[/C][/ROW]
[ROW][C]Confidence interval[/C][C]0.95[/C][/ROW]
[ROW][C]Type of Interval[/C][C]Left tail[/C][C]Right tail[/C][/ROW]
[ROW][C]Two-sided confidence interval at  0.95[/C][C]3.61744095993594[/C][C]4.93635971376001[/C][/ROW]
[ROW][C]Left one-sided confidence interval at  0.95[/C][C]3.70466242131918[/C][C]+inf[/C][/ROW]
[ROW][C]Right one-sided confidence interval at  0.95[/C][C]0[/C][C]4.80868448592078[/C][/ROW]
[ROW][C]more information about confidence interval[/C][/ROW]
[/TABLE]
Source: https://freestatistics.org/blog/index.php?pk=22746&T=1

Globally Unique Identifier (entire table): ba.freestatistics.org/blog/index.php?pk=22746&T=1

As an alternative you can also use a QR Code:  
QR Code


The GUIDs for individual cells are displayed in the table below:

Testing Variance - Confidence Intervals for Population Variance
Sample size320
Sample variance4.2
Confidence interval0.95
Type of IntervalLeft tailRight tail
Two-sided confidence interval at 0.953.617440959935944.93635971376001
Left one-sided confidence interval at 0.953.70466242131918+inf
Right one-sided confidence interval at 0.9504.80868448592078
more information about confidence interval


Figures (Output of Computation)

Input Parameters & R Code

Parameters (Session):
par1 = 320 ; par2 = 4.2 ; par3 = 0.95 ;
Parameters (R input):
par1 = 320 ; par2 = 4.2 ; par3 = 0.95 ;
R code (references can be found in the software 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('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('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')