Question

Medal rewarded:)

What is the value of b in the quadratic regression equation for these points: (2, 5), (4, 11), (5, 41), and (9, -2)?
A. -14.92
B. 10.76
C. 15.62
D. 26.06

Answer 1

do you have a calculator?

Answer 2

yes:)

Answer 3

so what would I need to do to find out my answer?

Answer 4

Go to this website which is a quadratic regression equation calculator.
Enter the x,y values of the 4 points and click on calculate quadratic equation and it will tell you the regression equation:
http://www.had2know.com/academics/quadratic-regression-calculator.html

Answer 5

yeah that works, but it would be wise to know how your calculator works

Answer 6

set your L1 as your y-axis and L2 as your x-axis
input the values
let me know once you've done that

Answer 7

im so confused lol

Answer 8

okay that means either your calculator is not built for graphing or you just don't know how to use it

Answer 9

what model and make is your calculator?

Answer 10

i dont have a graphing calculator lol, i just have my phone

Answer 11

that wouldn't work

Answer 12

USE this one http://www.mesacc.edu/~johrx98491/TI-Emulator.html
it is an emulator that you can use with your computer
I think Salman Khan of Khan Academy even uses it

Answer 13

I have a mac osx so I can't really vouch it myself, but my classmates have used it with their windows operating laptop

Answer 14

is A the correct answer?

Answer 15

??

Answer 16

I wouldn't know, because I don't have a graphing calculator at the moment

Answer 17

but if you want rapid answer use wolframalpha.com
input "quadratic fit{insert all of your coordinates}
use { } instead of ( )
so your first portion will have {{ and your last portion will have }}

Answer 18

http://www.wolframalpha.com/input/?i=quadratic+fit%7B%7B2%2C+5%7D%2C+%7B4%2C+11%7D%2C+%7B5%2C+41%7D%2C+and+%7B9%2C+-2%7D%7D
there I did it for you
so your b is 26.06 if it were rounded off to 2 decimal points