Confidence Interval for Prediction in Weighted Regression

Hi everyone,

I'm currently writing my final year project in analytical chemistry, and have got to the stage of calculating confidence intervals for weighted regression. Unfortunately, I have not been able to find and good resources to help me with this.

Basically, my problem is as follows.

I have done a weighted linear regression on my data, and I have calculated a value of x from my equation, however I don't know what formula to use to calculate my CI; I just know that it is different to the one used in unweighted regression.

If anyone could help me, or send me a link to an article describing this problem, I would be ever so grateful!