Question

Which is the exponential regression equation?

Answer 1

Look here, near the bottom of the page http://www.zweigmedia.com/RealWorld/calctopic1/regression.html

Answer 2

I need to know how to do it. I've tried everything.

Answer 3

The general form of the exponential function is \(y=Ar^x\)

if you take the logarithm of all the y values, you get a straight line.

\(log(y)=m*x+b\)

find the slope (m) and the intercept (b).

then \(r=10^m\) and \(A=10^b\)

Answer 4

so the slope is \(m=\dfrac{log(y_2)-log(y_1)}{x_2-x_1}\)

can you find \(b\)?

Answer 5

y = 3.807 1.042x
?

Answer 6

sorry, i'm not getting notifications.

so i kept getting weird values, so i graphed it on excel with \((x,~log(y))\) coordinates.

i got y = 0.0177x + 0.5691

so \(\sf r=10^{0.0177}=1.041597671\) and \(\sf A=10^{0.5691}=3.70766084\)

so the equation is \(\sf y=3.71*1.042^x\)

which is very close to the last option