I'm trying to create error bars on excel for a regression problem, but something is not working right. I tried following my instructor's directions, but I think something is wrong with them. Here is the formula I added to the formula bar: $b$30+$b$31*$a2+sqrt($d$26) b30 and b31 are my intercept + slope, a2 is my x values, and d26 is the MS residual. I should be getting an error bar above my original line, but instead I'm getting the original line. Can someone please tell me what I'm doing wrong? Thank you.