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emmynimmy
 one year ago
Which is the exponential regression equation?
emmynimmy
 one year ago
Which is the exponential regression equation?

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aaronq
 one year ago
Best ResponseYou've already chosen the best response.0Look here, near the bottom of the page http://www.zweigmedia.com/RealWorld/calctopic1/regression.html

emmynimmy
 one year ago
Best ResponseYou've already chosen the best response.0I need to know how to do it. I've tried everything.

aaronq
 one year ago
Best ResponseYou've already chosen the best response.0The 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 \(A=10^b\)

aaronq
 one year ago
Best ResponseYou've already chosen the best response.0so the slope is \(m=\dfrac{log(y_2)log(y_1)}{x_2x_1}\) can you find \(b\)?

aaronq
 one year ago
Best ResponseYou've already chosen the best response.0sorry, 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
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