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#1 Re: Help Me ! » Urgent Assignment Help Needed! » 2011-04-07 03:47:09

Alive

Thanks a bunch guys! There's only one question I couldn't do. 2(Regression)c) Does it just want how much linear it is? Should I just say that it has a strong positive linear relationship? Thanks.

#2 Re: Help Me ! » Urgent Assignment Help Needed! » 2011-04-07 00:16:00

Alive

Thanks for the help guys but for goodness sakes could you just help me with the residuals, thanks!

#3 Re: Help Me ! » Urgent Assignment Help Needed! » 2011-04-06 23:55:44

Alive

Don't worry lol, I thought you were going to find the data that can be transformed exactly but that's going to take long. Could you help me with the residuals part?

#4 Re: Help Me ! » Urgent Assignment Help Needed! » 2011-04-06 23:45:56

Alive

It will be WONDERFUL if you can bob bundy.

By the way, to get the residual.. for example:
1.4216915 (1965) - 2475.611
= 318
= y data - y pred
= 320 - 318
= 2
Is that the right method????

1.421695 (1966) - 2475.611
= 319.44137
= 321 - 319.4
= 1.6

Is that the way we get the residuals for each of them???

Edit: I might not change my data, just go through with it...

#5 Re: Help Me ! » Urgent Assignment Help Needed! » 2011-04-06 22:58:42

Alive

Wait.. select what??

Should I make the y axis the population and the x axis the land area???? and where will I label the country when putting it into my scatter...........................

edit: I need two transformations.

#6 Re: Help Me ! » Urgent Assignment Help Needed! » 2011-04-06 22:51:47

Alive

Can you guys please find me some new data? I don't know how to find them... And I haven't come so far anyway, so I guess doing it altogether will be the best option........... Please find me data that has 25 data in it please and can transform easily!

#7 Re: Help Me ! » Urgent Assignment Help Needed! » 2011-04-06 22:46:31

Alive

Okay,

http://img849.imageshack.us/img849/6446/cci0704201100001.jpg

#8 Re: Help Me ! » Urgent Assignment Help Needed! » 2011-04-06 22:34:15

Alive

Quadratic transformations?????
I changed my data because I thought it needed to be straight as possible... Fail...
Now what? Get new data or something? *A.s.a.p help please?*

#9 Re: Help Me ! » Urgent Assignment Help Needed! » 2011-04-06 20:34:34

Alive

Thanks, could you please quickly guide me through all the other questions as well as time is running out, Thanks for the help till now though smile

#10 Re: Help Me ! » Urgent Assignment Help Needed! » 2011-04-06 19:14:42

Alive

Example:
Do we just put in 320 to the regression formula:
y = 1.4216915 (320) - 2475.611
for each one of them?

#11 Re: Help Me ! » Urgent Assignment Help Needed! » 2011-04-06 16:12:19

Alive

Thanks, it now comes up as  y = 1.4216915x -2475.611
And so the residuals will be different now??

#12 Re: Help Me ! » Urgent Assignment Help Needed! » 2011-04-06 15:24:30

Alive

I put the data into the calculator and pressed linear regression, I guess I must have done it wrong somehow. Coming back to what the teacher said, should we plot the y value as the residuals or the original data? Original data makes more sense...

#13 Re: Help Me ! » Urgent Assignment Help Needed! » 2011-04-06 14:35:22

Alive

Could you please check if you did the linear regression right? Cause it looks a little different from my calculation.
My one comes up as:
y = -2484.326+1.4261551x
The teacher wants us to put the residuals in the y axis and leave the x axis like it is for question  (years..) for question 1b), did I not understand this correctly because in the questions it doesn't state to do this.. it only states it in 2c)

#14 Re: Help Me ! » Urgent Assignment Help Needed! » 2011-04-04 09:47:22

Alive

Then there's no interpolation left for my data? So I should make spaces between them?

New Data gathered:

Year - CO2 (ppm)
1965 320
1966 321
1967 322
1968 323
1969 324
1970 326
1971 326
1972 327
1973 330
1974 330
1975 331
1976 332
1977 334
1978 335
1979 337
1981 340
1983 343
1985 346
1987 349
1989 353
1991 355
1993 357
1995 361
1997 364
1999 369

Could you please explain the rest as well, residuals and transformations, Thanks.

#15 Re: Help Me ! » Urgent Assignment Help Needed! » 2011-04-03 23:59:13

Alive

Okay I'm changing my data... It actually won't work... Cause it's got no relation really.. I'm changing it to this:

Year - CO2 (ppm)
1975 331
1976 332
1977 334
1978 335
1979 337
1980 339
1981 340
1982 341
1983 343
1984 344
1985 346
1986 347
1987 349
1988 351
1989 353
1990 354
1991 355
1992 356
1993 357
1994 359
1995 361
1996 363
1997 364
1998 367
1999 369

#16 Re: Help Me ! » Urgent Assignment Help Needed! » 2011-04-03 22:14:39

Alive

Which values? I still don't get it. Please give an example.

Also please help explaining what to do for the rest.. Like residuals, transformation. Thanks smile

#17 Help Me ! » Urgent Assignment Help Needed! » 2011-04-03 21:40:02

Alive
Replies: 38

Hi, I need step by step in the questions for an assignment. I don't want you guys to do it  but I need to understand what to do. Really appreciate it if you give the method to do these!

First of all this is a Core Assignment (Correlation and regression)
We are to select numerical bivariate data (eg from the web) where you think there is probably a correlation. It must be real. Example; Global temperature vs time in years.

Part 1, I know how to do.. But when it comes to Part 2, I'm not really sure.. I know how to get the least squares regression line but making predictions for interpolation and interpolation?? I don't know how to do..? What predictions??? Don't know Residuals either.. 
For Part 3, do we transform this graph? For example make a graph with y to x squared, and then make one for y to the log ? And make predictions which I again don't know how to?
Please guys this is Really urgent and no time left. Please answer directly, Thanks!

cci0404201100000.jpg

cci0404201100001.jpg

#18 Help Me ! » Comment on these graphs please » 2011-03-21 20:58:02

Alive
Replies: 1

Just on their shape please, linear... positive... line of best fit, Thanks.

snapshot3ny.png

51189836.png

67933345.png

83327448.png

#19 Re: Help Me ! » Transformations with Matrices » 2011-03-13 23:14:21

Alive

Could you do it algebraically please.

#20 Help Me ! » Sum, difference and product functions » 2011-03-13 19:23:50

Alive
Replies: 1

Waiting for a reply in the thread before this : http://www.mathisfunforum.com/viewtopic.php?id=15222

Could you please explain as many as you can? (Questions and solutions provided)

Andysnap009.png

Andysnap010.png

Andysnap011.png

#21 Re: Help Me ! » Transformations with Matrices » 2011-03-13 16:41:47

Alive

These are the answers... I still don't know how to do 3)...

Andysnap007.png

These are examples from the textbook

Andysnap002.png

Andysnap004.png

Andysnap003.png

Andysnap005.png

#22 Help Me ! » Transformations with Matrices » 2011-03-13 02:17:46

Alive
Replies: 5

I have a test in two days, so please help me out with these matrice questions. Not much time left so please write up the way to the questions..

snapshot2y.png

I've done everything up until 3... Please complete a few from question 3...

#23 Re: Help Me ! » Revision [Question and Answers Provided] Need help understanding ASAP » 2011-03-10 01:09:21

Alive

^+1

#24 Re: Help Me ! » Revision [Question and Answers Provided] Need help understanding ASAP » 2011-03-10 01:02:16

Alive

Thanks bobbym and bob bundy, with the help of your answers it was really easy to overcome the difficulties smile

#25 Re: Help Me ! » Revision [Question and Answers Provided] Need help understanding ASAP » 2011-03-10 00:58:50

Alive

I thought questions were going to be harder but it was just kind of the general things like find the point of intersection, turning point.. binomial theorem.. transformation of graphs.. + absolute value... It was pretty easy. Next test will be harder I guess with modules, matrices etc..

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