Quadratic Regression

Using a calculator to perform a quadratic regression

[homer]

Is there a video that shows how to determine a quadratic regression by hand?

[fostermartinez]

🙏 Thank you so much, you saved my entire math class. 😂

[karmanyaahm]

For some reason, I can't find this on the Khan Academy website

[likkledee]

great, I have a statistics tes ton this tomorrow, thanks.

[guerreirodasflores]

Ok, but i wanna know how to do it *by hand* and without a calculator.

[Samonomics]

@pratiksrc is standard knowledge for projectiles, projectiles always follow a parabola - x^2 so quadratic dats why. its just summut you have to know for this example. ovawise its trial and error by looking at the graphs for the original data

[shazaduh]

Can't wait to see the computer algorithm for quadratic regression video. Do you think Excel would be better to illustrate this concept?

[skydutch]

... so what's r^2 equal to and how do you use a calculator to find it? Trying to find how to calculate the regression itself

[orbsandtea]

Ok, found out the theoretical height as a function of time in a vacuum:
-(1/2)g t^2 + Vy0 t
g= gravitational acceleration
Vy0= starting velocity in the y direction

And Vy0=40*sin(70)=37, 6
h(t)=-4, 9t^2+37, 6t Voila!

We can solve for h=0 and get how long it takes before landing: t=7, 67

Finding velocity in x direction (stays constant because the only force, gravity, works at an 90 angle): Vx=37, 6
37, 6m/s*7, 67s=288m

That ball'll travel 300 meters in a vacuum!
I love MATHS! <3

[pratiksrc]

how did u know that u were going to use quadratic regression.. why not linear or power3 regression.. anyone help please

[elbay]

@bryanfunk You can probably find a TI-85 emulator by using a Google search; I download an HP-15C emulator fairly easily.

[TranceAddict]

@purefatdude2 Grade of math as in level of math? I'm doing this stuff in Brief Calculus if that helps

[TheKillerKaiser]

If i want to do it but with an equation with terms c1-c2*x^2=y(x), how can i get it?

[bryanfunk]

where can i get that calculator for my pc?

[purefatdude]

@TranceAddict2 nvm
u learn it in algbera 1