Project Help

Hey all,

I'm trying to determine how best to do a 95% confidence interval and a standard deviation around a best fit line. In this example, I know that Pricing (Y-Axis) is dependant on Size (X-Axis). Instead of doing just a CI or SD around the mean of the data (which I know how to do), I'd like to draw bands around the best fit line, since I know I need to take into consideration the relationship. The best fit line is a power curve. Y=45.3 X ^(-0.268)

Can anyone provide some guidance on how to do this, preferrably using excel, as I don't have a stats package currently? I am trying to get an answer by tomorrow morning, so any help would be greatly appreciated.