anonymous
  • anonymous
Can someone explain the STANDARD DEVIATION OF THE DIFFERENCES formula to me?
Mathematics
  • Stacey Warren - Expert brainly.com
Hey! We 've verified this expert answer for you, click below to unlock the details :)
SOLVED
At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.
katieb
  • katieb
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
anonymous
  • anonymous
@jagatuba @Jemurray3 @jhonyy9 @karatechopper @phi @robtobey @satellite73
anonymous
  • anonymous
http://www.google.com/imgres?um=1&hl=en&sa=N&biw=1440&bih=809&tbm=isch&tbnid=EWj_RcUArXWHWM:&imgrefurl=http://www.socialresearchmethods.net/kb/statdesc.php&docid=jsqc7fluc6WZ7M&imgurl=http://www.socialresearchmethods.net/kb/Assets/images/statdes3.gif&w=474&h=300&ei=q6aNUJK4C5S08ATpvoGACg&zoom=1&iact=rc&dur=392&sig=112477054274050808931&page=1&tbnh=124&tbnw=198&start=0&ndsp=21&ved=1t:429,r:0,s:0,i:71&tx=156&ty=39
anonymous
  • anonymous
I am given 2 sets of 10 numbers. How do I plug them into this formula to get the correct answer?

Looking for something else?

Not the answer you are looking for? Search for more explanations.

More answers

jhonyy9
  • jhonyy9
so what numbers you have got for ????
anonymous
  • anonymous
1 Attachment
jhonyy9
  • jhonyy9
the sum across the values how you can get it ?
anonymous
  • anonymous
im confused about the top part of the formula. ive been getting the wrong answers so i must be doing something wrong.
jhonyy9
  • jhonyy9
sorry but this attachement i not can opening ,not id compatibly with my excell programm
anonymous
  • anonymous
1 Attachment
anonymous
  • anonymous
what about now?
jhonyy9
  • jhonyy9
can you rewrite me here the values for x and X the mean or average and the value for n ?
jhonyy9
  • jhonyy9
@robtobey can you opening this attachement please ?
anonymous
  • anonymous
(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 = n-1 (so 9)
jhonyy9
  • jhonyy9
have you any idea for this ?
anonymous
  • anonymous
yes but ive been getting the wrong answers. d bar = 1.5 so ive been doing ((129-1.5)^2+(237-1.5)^2+(110-1.5)^2+.......))
jhonyy9
  • jhonyy9
so how i see it there will be in numerator sqrt(sum(x-X)^2) divide by sqrt9 so divide by 3 ok ?
jhonyy9
  • jhonyy9
can you calcule first this sum ?
jhonyy9
  • jhonyy9
how many will be this sum ?
anonymous
  • anonymous
i got 270258.5 for x and 261262.5 for y then i subtracted the 2 to get 8996
anonymous
  • anonymous
then divide by 9 and square root it to get 31.616
anonymous
  • anonymous
but thats wrong
jhonyy9
  • jhonyy9
why divide by 9 and not by 3 ?
anonymous
  • anonymous
arent u supposed to do whats in the radical first and then square root it?
jhonyy9
  • jhonyy9
why you can separte it sqrt of numerator and sqrt of denominator and vide it after
jhonyy9
  • jhonyy9
and divide it after
anonymous
  • anonymous
i get the same answer either way
anonymous
  • anonymous
31.616
anonymous
  • anonymous
the right answer is 5.93
anonymous
  • anonymous
@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.
1 Attachment
jhonyy9
  • jhonyy9
how can i opening it what program i need using for ?
anonymous
  • anonymous
i provided all the necessary info above ^^^^^
jhonyy9
  • jhonyy9
so than you need calcule right this sum and after make the squareroot of them ,yes ?
jhonyy9
  • jhonyy9
so and after just divide it by 3
anonymous
  • anonymous
Ask @mariomintchev what version of Excel did she/he use to generate the spread sheet.
anonymous
  • anonymous
Excel 2010
anonymous
  • anonymous
SCREENSHOT
phi
  • phi
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 x-y 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
anonymous
  • anonymous
so ((-1-1.5)^2+(13-1.5)^2+(-3-1.5)^2+....)) ???
phi
  • phi
yes, then divide by 9 then take the square root.
anonymous
  • anonymous
ok, i got 5.95 so its close enough. thanks phi, i can always rely on you!
phi
  • phi
I got 5.930 (dd-1.5).^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
anonymous
  • anonymous
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)

Looking for something else?

Not the answer you are looking for? Search for more explanations.