A community for students.
Here's the question you clicked on:
 0 viewing
anonymous
 4 years ago
Can someone explain the STANDARD DEVIATION OF THE DIFFERENCES formula to me?
anonymous
 4 years ago
Can someone explain the STANDARD DEVIATION OF THE DIFFERENCES formula to me?

This Question is Closed

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0@jagatuba @Jemurray3 @jhonyy9 @karatechopper @phi @robtobey @satellite73

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0I am given 2 sets of 10 numbers. How do I plug them into this formula to get the correct answer?

jhonyy9
 4 years ago
Best ResponseYou've already chosen the best response.1so what numbers you have got for ????

jhonyy9
 4 years ago
Best ResponseYou've already chosen the best response.1the sum across the values how you can get it ?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0im confused about the top part of the formula. ive been getting the wrong answers so i must be doing something wrong.

jhonyy9
 4 years ago
Best ResponseYou've already chosen the best response.1sorry but this attachement i not can opening ,not id compatibly with my excell programm

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

jhonyy9
 4 years ago
Best ResponseYou've already chosen the best response.1@robtobey can you opening this attachement please ?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0(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)

jhonyy9
 4 years ago
Best ResponseYou've already chosen the best response.1have you any idea for this ?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0yes but ive been getting the wrong answers. d bar = 1.5 so ive been doing ((1291.5)^2+(2371.5)^2+(1101.5)^2+.......))

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

jhonyy9
 4 years ago
Best ResponseYou've already chosen the best response.1can you calcule first this sum ?

jhonyy9
 4 years ago
Best ResponseYou've already chosen the best response.1how many will be this sum ?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0i got 270258.5 for x and 261262.5 for y then i subtracted the 2 to get 8996

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0then divide by 9 and square root it to get 31.616

jhonyy9
 4 years ago
Best ResponseYou've already chosen the best response.1why divide by 9 and not by 3 ?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0arent u supposed to do whats in the radical first and then square root it?

jhonyy9
 4 years ago
Best ResponseYou've already chosen the best response.1why you can separte it sqrt of numerator and sqrt of denominator and vide it after

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0i get the same answer either way

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0the right answer is 5.93

anonymous
 4 years ago
Best 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.

jhonyy9
 4 years ago
Best ResponseYou've already chosen the best response.1how can i opening it what program i need using for ?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0i provided all the necessary info above ^^^^^

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

jhonyy9
 4 years ago
Best ResponseYou've already chosen the best response.1so and after just divide it by 3

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Ask @mariomintchev what version of Excel did she/he use to generate the spread sheet.

phi
 4 years ago
Best ResponseYou've already chosen the best response.1They 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

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0so ((11.5)^2+(131.5)^2+(31.5)^2+....)) ???

phi
 4 years ago
Best ResponseYou've already chosen the best response.1yes, then divide by 9 then take the square root.

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0ok, i got 5.95 so its close enough. thanks phi, i can always rely on you!

phi
 4 years ago
Best ResponseYou've already chosen the best response.1I 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

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0i 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)
Ask your own question
Sign UpFind more explanations on OpenStudy
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.