About CubicReg, QuartReg...

[hippo326]

hey guys.. i found this kind of question in multiple choice of MAV 08 paper:
The equation of the cubic function for which the graph passes through the points
(0,1) (-1,-4/3) (1, 4/3) (2, 5/3) is:
... ... ....
as i known for this sort of questions.. we have to use STAT,, edit the table and then
go STAT CALC.. and choose CubitReg right?
but then my calculator displays: DIM MISMATCH..

is there problem in my setting or something? how do i fix it? :knuppel2: :knuppel2:

[shinny]

I think that means you screwed up entering your lists. Usually means that you've got more elements in one list than the other.
Your lists should be:
L1: {0,-1,1,2} and
L2: {1,-4/3,4/3,5/3}
After that, CubicReg should work

[hippo326]

I tried this but doesnt work.. im sure theres a mistake in my setting
cos i used to solve these kind of quiz from my notes but it jst doesnt
work now ..

[Flaming_Arrow]

hey guys.. i found this kind of question in multiple choice of MAV 08 paper:
The equation of the cubic function for which the graph passes through the points
(0,1) (-1,-4/3) (1, 4/3) (2, 5/3) is:
... ... ....
as i known for this sort of questions.. we have to use STAT,, edit the table and then
go STAT CALC.. and choose CubitReg right?
but then my calculator displays: DIM MISMATCH..

is there problem in my setting or something? how do i fix it? :knuppel2: :knuppel2:

Is ur calc ti-89?

[hippo326]

guys.. i solved it.. its just my lists are screwed up strangely..
its L1 then L3, L4 ...
if any1 else hav this problem like me.. remember to do this
CubicReg L1,L3, Y1
L1,2,3,4, depend on where u put the data into**
goodluckk

[Chocoholic]

hey hippo, if you want to get L2 back press STAT then EDIT. Then go to the top of L3 so it's highlighted then press 2nd DEL(INS). This will allow you to create a new list. Then press L2.

[hippo326]

tyty =)

[mikola1989]

i just tried it on mine and i found, using stat list editor on my TI-89, that i get a domain error whenever i try to use cubicreg with the exact/approx setting set to exact, it works when in auto mode though. any ideas anyone?

[chlloe]

Is there another way of doing this? We never got taught STAT stuff!!

Couldnt you sub those into the general equation, and solve? Or even matrices?

[hippo326]

u gotta learn it cos they might ask u the appropriate equation from mc

[shinny]

Yeh I've had a few Q's in MC where this has been useful. VCAA '06 sample which I did just then had one.