Question

Please someone!!! Find a linear quadratic and a cubic model for the data. Which models best fits the data.
X=3 8 15 21
Y=7 11 26 44

Answer 1

This is a real pain to do by hand, so the next best thing is either a calculator or something like excel

Answer 2

i need to show some work though

Answer 3

are there any examples in your book that show how to show the work

hopefully there's at least a formula shown or something because I'm blanking on the formula needed...one sec

Answer 4

if you wanted to do linear regression, then you would use the formulas on this page

http://serc.carleton.edu/introgeo/teachingwdata/StatRegression.html

Answer 5

you know what I read my book and it says to use a calculator so i hope my teacher is ok with little work.
can u help me with this one though!
Find a quadratic function whose only real zeros are 4 and 6

Answer 6

the formulas for quadratic regression can be found here

http://www.azdhs.gov/lab/license/tech/calibration-training/calibration/documents/12_Quadratic-Least-Squares-Regression-Calib.pdf

** look at page 10 **

but as you can see it gets really ugly (if it wasn't ugly before) really fast...

Answer 7

Find a quadratic function whose only real zeros are 4 and 6


x = 4 or x = 6


x - 4 = 0 or x - 6 = 0


(x - 4)(x - 6) = 0


x^2 - 6x - 4x + 24 = 0


x^2 - 10x + 24 = 0


So the quadratic with the two real zeros 4 and 6 is y = x^2 - 10x + 24

Answer 8

thanks so much u are a life saver!!!

Answer 9

The cubic looks real good.
The Mathematica calculation is attached.