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mariomintchev
Group Title
Can someone explain the STANDARD DEVIATION OF THE DIFFERENCES formula to me?
 one year ago
 one year ago
mariomintchev Group Title
Can someone explain the STANDARD DEVIATION OF THE DIFFERENCES formula to me?
 one year ago
 one year ago

This Question is Closed

mariomintchev Group TitleBest ResponseYou've already chosen the best response.1
@jagatuba @Jemurray3 @jhonyy9 @karatechopper @phi @robtobey @satellite73
 one year ago

mariomintchev Group TitleBest ResponseYou've already chosen the best response.1
I am given 2 sets of 10 numbers. How do I plug them into this formula to get the correct answer?
 one year ago

jhonyy9 Group TitleBest ResponseYou've already chosen the best response.1
so what numbers you have got for ????
 one year ago

jhonyy9 Group TitleBest ResponseYou've already chosen the best response.1
the sum across the values how you can get it ?
 one year ago

mariomintchev Group TitleBest ResponseYou've already chosen the best response.1
im confused about the top part of the formula. ive been getting the wrong answers so i must be doing something wrong.
 one year ago

jhonyy9 Group TitleBest ResponseYou've already chosen the best response.1
sorry but this attachement i not can opening ,not id compatibly with my excell programm
 one year ago

mariomintchev Group TitleBest ResponseYou've already chosen the best response.1
what about now?
 one year ago

jhonyy9 Group TitleBest ResponseYou've already chosen the best response.1
can you rewrite me here the values for x and X the mean or average and the value for n ?
 one year ago

jhonyy9 Group TitleBest ResponseYou've already chosen the best response.1
@robtobey can you opening this attachement please ?
 one year ago

mariomintchev Group TitleBest ResponseYou've already chosen the best response.1
(column 1) x = 129, 237, 110, 32, 322, 134, 119, 32, 172, 149 total sum for x = 1436 mean for x = 143.6 (column 2) y = 130, 224, 113, 38, 320, 124, 122, 33, 169, 148 total sum for y = 1421 mean for y = 142.1 value for n = 10 df = n1 (so 9)
 one year ago

jhonyy9 Group TitleBest ResponseYou've already chosen the best response.1
have you any idea for this ?
 one year ago

mariomintchev Group TitleBest ResponseYou've already chosen the best response.1
yes but ive been getting the wrong answers. d bar = 1.5 so ive been doing ((1291.5)^2+(2371.5)^2+(1101.5)^2+.......))
 one year ago

jhonyy9 Group TitleBest ResponseYou've already chosen the best response.1
so how i see it there will be in numerator sqrt(sum(xX)^2) divide by sqrt9 so divide by 3 ok ?
 one year ago

jhonyy9 Group TitleBest ResponseYou've already chosen the best response.1
can you calcule first this sum ?
 one year ago

jhonyy9 Group TitleBest ResponseYou've already chosen the best response.1
how many will be this sum ?
 one year ago

mariomintchev Group TitleBest ResponseYou've already chosen the best response.1
i got 270258.5 for x and 261262.5 for y then i subtracted the 2 to get 8996
 one year ago

mariomintchev Group TitleBest ResponseYou've already chosen the best response.1
then divide by 9 and square root it to get 31.616
 one year ago

mariomintchev Group TitleBest ResponseYou've already chosen the best response.1
but thats wrong
 one year ago

jhonyy9 Group TitleBest ResponseYou've already chosen the best response.1
why divide by 9 and not by 3 ?
 one year ago

mariomintchev Group TitleBest ResponseYou've already chosen the best response.1
arent u supposed to do whats in the radical first and then square root it?
 one year ago

jhonyy9 Group TitleBest ResponseYou've already chosen the best response.1
why you can separte it sqrt of numerator and sqrt of denominator and vide it after
 one year ago

jhonyy9 Group TitleBest ResponseYou've already chosen the best response.1
and divide it after
 one year ago

mariomintchev Group TitleBest ResponseYou've already chosen the best response.1
i get the same answer either way
 one year ago

mariomintchev Group TitleBest ResponseYou've already chosen the best response.1
31.616
 one year ago

mariomintchev Group TitleBest ResponseYou've already chosen the best response.1
the right answer is 5.93
 one year ago

robtobey Group TitleBest ResponseYou've already chosen the best response.0
@jhonyy9 It may to late for solving this problem. Attached is a screen capture of part of the xls file. I am running on a mid 2010 IMac with 8Gb of ram to support virtual versions of Windows XP pro, Windows 98SE and in the past Ubuntu Linux. The xls file is not a normal spread sheet data file. All I can provide is a screen capture of what I see.
 one year ago

jhonyy9 Group TitleBest ResponseYou've already chosen the best response.1
how can i opening it what program i need using for ?
 one year ago

mariomintchev Group TitleBest ResponseYou've already chosen the best response.1
i provided all the necessary info above ^^^^^
 one year ago

jhonyy9 Group TitleBest ResponseYou've already chosen the best response.1
so than you need calcule right this sum and after make the squareroot of them ,yes ?
 one year ago

jhonyy9 Group TitleBest ResponseYou've already chosen the best response.1
so and after just divide it by 3
 one year ago

robtobey Group TitleBest ResponseYou've already chosen the best response.0
Ask @mariomintchev what version of Excel did she/he use to generate the spread sheet.
 one year ago

mariomintchev Group TitleBest ResponseYou've already chosen the best response.1
Excel 2010
 one year ago

mariomintchev Group TitleBest ResponseYou've already chosen the best response.1
SCREENSHOT
 one year ago

phi Group TitleBest ResponseYou've already chosen the best response.1
They want the standard deviation of the differences. Your formula tells you how to find the standard deviation of a list of numbers. The first step is find the list of numbers: the list of differences so find xy where x= 129, 237, 110, 32, 322, 134, 119, 32, 172, 149 y = 130, 224, 113, 38, 320, 124, 122, 33, 169, 148 the differences (call it z) are z= 1 13 3 6 2 10 3 1 3 1 now use your formula to find the standard deviation
 one year ago

mariomintchev Group TitleBest ResponseYou've already chosen the best response.1
so ((11.5)^2+(131.5)^2+(31.5)^2+....)) ???
 one year ago

phi Group TitleBest ResponseYou've already chosen the best response.1
yes, then divide by 9 then take the square root.
 one year ago

mariomintchev Group TitleBest ResponseYou've already chosen the best response.1
ok, i got 5.95 so its close enough. thanks phi, i can always rely on you!
 one year ago

phi Group TitleBest ResponseYou've already chosen the best response.1
I got 5.930 (dd1.5).^2 6.2500 132.2500 20.2500 56.2500 0.2500 72.2500 20.2500 6.2500 2.2500 0.2500 sum(ans)/9 = 35.1667 sqrt(35.1667)= 5.9302
 one year ago

mariomintchev Group TitleBest ResponseYou've already chosen the best response.1
i must have made a little mistake somewhere when punching in all of those numbers and parenthesis. i understand what i need to do now though. thanks! =o)
 one year ago
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