Question

please help!

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

ewww, linear regression is difficult enough

Answer 2

http://www.wolframalpha.com/input/?i=quadratic+fit&a=*C.quadratic+fit-_*Calculator.dflt-&f2=%7B1%2C+5%2C+15%2C+24%2C+37%2C+50%7D&f=QuadraticFitCalculator.data%5Cu005f%7B1%2C+5%2C+15%2C+24%2C+37%2C+50%7D&a=*FVarOpt-_**QuadraticFitCalculator.data2--

Answer 3

the wolf gives about 26

Answer 4

http://www.wolframalpha.com/input/?i=quadratic+fit&a=*C.quadratic+fit-_*Calculator.dflt-&f2=%7B%7B2%2C5%7D%2C%7B4%2C11%7D%2C%7B5%2C41%7D%2C%7B9%2C-2%7D%7D&f=QuadraticFitCalculator.data2_%7B%7B2%2C5%7D%2C%7B4%2C11%7D%2C%7B5%2C41%7D%2C%7B9%2C-2%7D%7D&a=*FVarOpt.1-_***QuadraticFitCalculator.data2--.***QuadraticFitCalculator.data---.*--

Answer 5

ahh. thank you!!

Answer 6

youre welcome

i got no idea how youd do it by hand tho ... my ti83 has a quad line function, but its at the house :/