5 replies to this topic

[Ata.H.D]

hi

see this

if I want to calculate Var.P on CP400, what should I do ??

Edited by Ata.H.D, 08 July 2015 - 05:28 PM.

[pan.gejt]

Before starting I do some math first. You can compute Var.P by using of 2 methods:

 

1. method

                 Var.P=Var.S*(n-1)/n, Var.S is computed by ClassPad (command variance)

 

2. method

                 Var.P = (sigmax)² , where sigmax means population standard deviation

               

                similarly

                Var.S = (sx)² , where sx means sample standard deviation

------------------------------------------------------------------------------------------------------------

 

the 1st method is suitable for list calculation,

 

Var.P = variance(list1)*(dim(list1)-1)/dim(list1), the list1 is used

 

in your case:

Var.S = variance = 27130, n=dim(list1)=5

Var.P = 27130*(5-1)/5

Var.P = 21704

 

the 2nd method is suitable for spreadsheet calculation, because the sigmax is calculated

 

sigmax = 26.0546, computed value

Var.P = sigmax²

Var.P =147.323² = 21704

 

sx = 164.712, computed value

Var.S = sx²

Var.S =164.712² = 27130         

[Ata.H.D]

Before starting I do some math first. You can compute Var.P by using of 2 methods:

 

1. method

                 Var.P=Var.S*(n-1)/n, Var.S is computed by ClassPad (command variance)

 

2. method

                 Var.P = (sigmax)² , where sigmax means population standard deviation

               

                similarly

                Var.S = (sx)² , where sx means sample standard deviation

------------------------------------------------------------------------------------------------------------

 

the 1st method is suitable for list calculation,

 

Var.P = variance(list1)*(dim(list1)-1)/dim(list1), the list1 is used

 

in your case:

Var.S = variance = 27130, n=dim(list1)=5

Var.P = 27130*(5-1)/5

Var.P = 21704

 

the 2nd method is suitable for spreadsheet calculation, because the sigmax is calculated

 

sigmax = 26.0546, computed value

Var.P = sigmax²

Var.P =147.323² = 21704

 

sx = 164.712, computed value

Var.S = sx²

Var.S =164.712² = 27130         

TanQ

but wich 1 is true??

Eg. I got these on exam!! what should I do??

[pan.gejt]

Sorry, I don't understand what you mean : "but which 1 is true??"

Both methods of computation are correct. 

Differences between Population and sample standard deviations

http://libweb.surrey...ter/page_18.htm

[pan.gejt]

It's interesting much cheaper Classwizz computes both values directly

http://abload.de/img...11542228qx0.jpg

[Ata.H.D]

It's interesting much cheaper Classwizz computes both values directly

http://abload.de/img...11542228qx0.jpg

OMG !!!!

 

hi

after e-mail , I got this

Edited by Ata.H.D, 13 July 2015 - 01:23 PM.